Commits · master · Kirill Smelkov / zodbtools

21 Oct, 2024 1 commit

tests: Fix ztestdata-related tests on ZODB4 · 405bd60e

Kirill Smelkov authored Oct 18, 2024

In bf772ce0 I introduced ztestdata fixture and we added several tests
that use this fixture instead of only zext fixture. But contrary to zext
I missed to corresponding xfail if underlying ZODB is ZODB4 and does not
support access to raw extension bytes. As the result several tests
started to fail with ZODB4, because on such ZODB extension is only
dumped via heuristic and on best-effort basis and that cannot match
original extension data bit to bit exactly:

https://lab.nexedi.com/nexedi/zodbtools/-/blob/36cba871/zodbtools/zodbdump.py#L93-102

One example failure is here:

https://erp5js.nexedi.net/#/test_result_module/20241017-58899E0D/2

-> Fix that by xfailing in both zext and ztestdata fixtures
consistently.
Co-authored-by: Jérome Perrin <jerome@nexedi.com>
/reviewed-on nexedi/zodbtools!31 and nexedi/zodbtools!32

405bd60e

17 Oct, 2024 2 commits

gen_testdata: do not depend on machine timezone · b0fdb5fe

Jérome Perrin authored Oct 16, 2024

Initialize the timezone setting when setting up controlled time.time,
to GMT-3 because the current test data was created with this timezone.

/reviewed-by @kirr
/reviewed-at !31

b0fdb5fe

tests: fix ZEO fixture for ZEO < 5 · 593bd165

Jérome Perrin authored Oct 15, 2024

ZEOConfig started to accept `log` argument in ZEO 5, see commit
https://github.com/zopefoundation/ZEO/commit/6e13bbe85

/reviewed-by @kirr
/reviewed-at !31

593bd165

11 Oct, 2024 1 commit

*: Support ZODB6 · 36cba871

Jérome Perrin authored Oct 10, 2024

ZODB6 no longer have ZODB._compat.BytesIO , manage this compatibility
layer ourselves.

--------
kirr: ZODB dropped ZODB._compat.BytesIO in https://github.com/zopefoundation/ZODB/commit/6f887812.

/reviewed-by @kirr
/reviewed-on !30

36cba871

17 Jul, 2024 16 commits

Test under all py2_pickle{1,2,3} and py3_pickle3 ZODB kinds + fix discovered issues · f9d36ba7

Kirill Smelkov authored Jul 17, 2024

Hello @jerome,

For ZODB/go and WCFS, in order to support Python3 and Python2 with recent
ZODB5, I need to extend generated test databases to cover all ZODB kinds
instead of only ZODB/py2 + pickle protocol=2 we had before. This resulted in
`run_with_all_zodb_pickle_kinds` utility inside gen_testdata.py and zodbtools
also becoming well tested under all kinds of ZODB databases:

    py2: ZODB 4 and ZODB5 < 5.3     (pickle protocol 1)
    py2: ZODB 5.3                   (pickle protocol 2)
    py2: ZODB ≥ 5.4                 (pickle protocol 3)
    py3: ZODB4 and ZODB5            (pickle protocol 3)

Please find the patches that do that for zodbtools attached. Some problems
popped up due to extended testing coverage and they are fixed as well.

Please see individual patches for details.

Kirill

/cc @vnmabus, @levin.zimmermann
/reviewed-by @jerome
/reviewed-on !29

f9d36ba7

*: Cosmetics · dbfea935

Kirill Smelkov authored Jul 16, 2024

Fix noticed typos, remove shebang from py source not intended to be
executed.

dbfea935

*: Fix pyflakes · 7f45f6da

Kirill Smelkov authored Jul 16, 2024

    (zdev+py39.env) kirr@deca:~/src/wendelin/z/zodbtools/zodbtools$ python3 -m pyflakes .
    ./test/test_dump.py:32:1: 'pytest.xfail' imported but unused

Unused xfail import was there in test_dump.py from 425e6656 (dump,
commit: Test for both non-empty and empty transaction extensions).

7f45f6da

commit: test: Use at0 instead of head to represent initial transaction ID · df9b1425

Kirill Smelkov authored Jul 16, 2024

`head` name is a bit ambiguous because it might be perceived as
referring to currently latest transaction ID, but in that test it
refers to latest transaction ID when the test starts.

Rename it to at0 for clarity.

Just added test_zodbcommit_cmd already uses at0  to represent initial
transaction ID (and at1 + at2 to represent follow-up transaction IDs).

In general using atX naming comes from WCFS functional tests where it is
used widely - see e.g.
https://lab.nexedi.com/nexedi/wendelin.core/-/blob/07087ec8/wcfs/wcfs_test.py#L1539-1581

df9b1425

commit: Fix it wrt ZEO · 858c134c

Kirill Smelkov authored Jul 16, 2024

Since 7ae5ff82 (Port zodbtools to py3) zodbtools/py3 requires
nexedi/pygolang!21 with which
running `zodb commit` wrt ZEO, as demonstrates by added
test_zodbcommit_cmd, yields:

test/test_commit.py::test_zodbcommit_cmd[ZEO-!zext] Traceback (most recent call last):
File "/usr/lib/python2.7/runpy.py", line 174, in _run_module_as_main
"__main__", fname, loader, pkg_name)
File "/usr/lib/python2.7/runpy.py", line 72, in _run_code
exec code in run_globals
File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodb.py", line 133, in <module>
main()
File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodb.py", line 129, in main
return command_module.main(argv)
File "<decorator-gen-4>", line 2, in main
File "/home/kirr/src/tools/go/pygolang/golang/__init__.py", line 125, in _
return f(*argv, **kw)
File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodbcommit.py", line 232, in main
tid = zodbcommit(stor, at, txn)
File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodbcommit.py", line 131, in zodbcommit
_()
File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodbcommit.py", line 128, in _
stor.store(obj.oid, current_serial(obj.oid), data, '', txn)
File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodbcommit.py", line 87, in current_serial
return _serial_at(stor, oid, at)
File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodbcommit.py", line 152, in _serial_at
xdata = stor.loadBefore(oid, before)
File "/home/kirr/src/wendelin/z/ZEO5/src/ZEO/ClientStorage.py", line 616, in loadBefore
return self._server.load_before(oid, tid)
File "/home/kirr/src/wendelin/z/ZEO5/src/ZEO/asyncio/client.py", line 935, in load_before
return self.io_call(self.load_before_co(oid, tid, self.timeout))
File "/home/kirr/src/wendelin/z/ZEO5/src/ZEO/asyncio/client.py", line 862, in io_call
return future.result() if wait else future
File "/home/kirr/src/wendelin/z/ZEO5/src/ZEO/asyncio/futures.py", line 230, in result
return Future.result(self)
File "/home/kirr/src/wendelin/z/ZEO5/src/ZEO/asyncio/futures.py", line 81, in result
raise self._result
ClientDisconnected: [Errno 104] Connection reset by peer
FAILED()
zeo.log:

2024-07-16T21:13:45 ERROR ZEO.asyncio.server Can't deserialize message
Traceback (most recent call last):
File "/home/kirr/src/wendelin/z/ZEO5/src/ZEO/asyncio/server.py", line 100, in message_received
message_id, async_, name, args = self.decode(message)
File "/home/kirr/src/wendelin/z/ZEO5/src/ZEO/asyncio/marshal.py", line 119, in pickle_server_decode
return unpickler.load() # msgid, flags, name, args
File "/home/kirr/src/wendelin/z/ZEO5/src/ZEO/asyncio/marshal.py", line 176, in server_find_global
raise ImportError("Module not allowed: %s" % (module,))
ImportError: Module not allowed: golang

This happens because zodbcommit.main and zodbdump.DumpReader use bstr to
handle binary data and further pass as IStorageTransactionInformation
instance to ZEO via its RPC, but ZEO server explicitly checks safe to
import modules and rejects golang.

One way to fix would be to patch ZEO to allow golang imports, but in
general it is better to follow the interface strictly and stay 100%
compatible with its users. That's why the fix converts fields covered by
IStorageTransactionInformation to exact types specified by that
interface to stay 100% compatible with users of the interface because on
py3 e.g. (b' ' == ' ') returns False and so we need to be careful to
provide .status as exactly str instead bytes, and do the similar for
other fields.

858c134c

commit: test: Verify it with both FileStorage and ZEO · 961066fe

Kirill Smelkov authored Jul 16, 2024

There is currently one problem with `zodb commit` that exhibits it only
with ZEO. And it could be triggered only via commandline.

As a preparatory step for the fix add infrastructure to test zodbcommit
with both FileStorage and ZEO via zsrv fixture.

There is currently no breakage - test_commit continues to work ok. In
the next patch we will add test for commandline handling of `zodb
commit` and fix the issue.

P.S. Support code for testing wrt ZEO is based on wendelin.core :

https://lab.nexedi.com/nexedi/wendelin.core/-/blob/07087ec8/lib/testing.py#L230-308

Maybe in the future it would be a good idea to switch wendelin.core to
use zodbtools-provided ZSrv fixture.

961066fe

test/*: Add py3 + pickle protocol=3 ZODB kind to test matrix · 479c353d

Kirill Smelkov authored Jul 16, 2024

Adjust conftest.py and gen_testdata to generate test data files from
under ZODB/py3 . Adjust testutil to be able to open such databases from
under py2. As seen in the appendix the most difference in generated data
is that *UNICODE opcodes are used instead of *STRING. Adjust test_dump
to normalize UNICODE and further BYTES so that zdump.zpickledis.ok
golden files are handled ok under both py2 and py3.

Appendix.

    (zdev+py39.env) kirr@deca:~/src/wendelin/z/zodbtools/zodbtools/test/testdata/1_!zext$ xdiff py2_pickle3/zdump.zpickledis.ok py3_pickle3/zdump.zpickledis.ok
    diff --git a/py2_pickle3/zdump.zpickledis.ok b/py3_pickle3/zdump.zpickledis.ok
    index cd9d7f5..b44cbc8 100644
    --- a/py2_pickle3/zdump.zpickledis.ok
    +++ b/py3_pickle3/zdump.zpickledis.ok
    @@ -2,16 +2,16 @@ txn 0285cbac70a3d733 "p"
     user "user0.12"
     description "step 0.12"
     extension ""
    -obj 0000000000000001 34 sha1:fc9e49cca756681a9f36c915c6b7b8ad79f17cbc
    +obj 0000000000000001 37 sha1:fb5c1963fc8207cbf2e9959ebb9a29eec5f56ae1
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'f0.12'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'f0.12'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -19,16 +19,16 @@ txn 0285cbac7eb85219 "p"
     user "user0.15"
     description "step 0.15"
     extension ""
    -obj 0000000000000006 34 sha1:76a94af22a81cd970845aeb3536f428a96afcfc7
    +obj 0000000000000006 37 sha1:4baeb60acd0e085453e46bbeea395bf028652f28
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'e0.15'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'e0.15'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -36,16 +36,16 @@ txn 0285cbac917e4b4c "p"
     user "user0.19"
     description "step 0.19"
     extension ""
    -obj 0000000000000005 34 sha1:4bd994052ba9a6b1f328c252d8766f13c53ae209
    +obj 0000000000000005 37 sha1:de7296cc2cea8492226a55e9b4f42daa4070f5af
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'a0.19'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'a0.19'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -53,16 +53,16 @@ txn 0285cbac9ae147e6 "p"
     user "user0.21"
     description "step 0.21"
     extension ""
    -obj 0000000000000002 34 sha1:633b0e1e89447d452468367784717fb48b0b83b1
    +obj 0000000000000002 37 sha1:d9bd775ab8808616fc61abddd57f505c2e53e00e
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'd0.21'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'd0.21'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -70,16 +70,16 @@ txn 0285cbacada74119 "p"
     user "root0.0\nYour\nMagesty "
     description "undo 0.0\nmore detailed description\n\nzzz ..."
     extension ""
    -obj 0000000000000007 34 sha1:b4bf7b467c62a1b51099ba1cc5b5aecd444d598d
    +obj 0000000000000007 37 sha1:2e9378511903201204cb5f08a4d6c52033a05545
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'c0.22'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'c0.22'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -87,16 +87,16 @@ txn 0285cbacb258bf66 "p"
     user "root0.1\nYour\nMagesty "
     description "undo 0.1\nmore detailed description\n\nzzz ...\t"
     extension ""
    -obj 0000000000000003 34 sha1:3e5f02a2aa5f0ea3747a6c0ffeec090654091583
    +obj 0000000000000003 37 sha1:c83a8f07d208ea001abe540845e4ce75a7a32aee
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'g0.11'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'g0.11'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -104,71 +104,92 @@ txn 0285cbacbbbbbc00 "p"
     user ""
     description "predelete 4"
     extension ""
    -obj 0000000000000000 199 sha1:d9c10b69422e9a8279e2f738d9c270b88ee49861
    +obj 0000000000000000 265 sha1:63708dd8f80d0b1f30f35f220f3d2207cb44e034
           0: \x80 PROTO      3
           2: c    GLOBAL     'persistent.mapping PersistentMapping'
    -     40: q    BINPUT     1
    +     40: q    BINPUT     0
          42: .    STOP
       highest protocol among opcodes = 2
          43: \x80 PROTO      3
          45: }    EMPTY_DICT
    -     46: q    BINPUT     2
    -     48: U    SHORT_BINSTRING 'data'
    -     54: q    BINPUT     3
    -     56: }    EMPTY_DICT
    -     57: q    BINPUT     4
    -     59: (    MARK
    -     60: U        SHORT_BINSTRING 'a'
    -     63: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x05'
    -     73: c        GLOBAL     '__main__ Object'
    -     90: q        BINPUT     5
    -     92: \x86     TUPLE2
    -     93: Q        BINPERSID
    -     94: U        SHORT_BINSTRING 'c'
    -     97: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x07'
    -    107: h        BINGET     5
    -    109: \x86     TUPLE2
    -    110: Q        BINPERSID
    -    111: U        SHORT_BINSTRING 'b'
    -    114: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x08'
    -    124: h        BINGET     5
    -    126: \x86     TUPLE2
    -    127: Q        BINPERSID
    -    128: U        SHORT_BINSTRING 'e'
    -    131: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x06'
    -    141: h        BINGET     5
    -    143: \x86     TUPLE2
    -    144: Q        BINPERSID
    -    145: U        SHORT_BINSTRING 'd'
    -    148: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x02'
    -    158: h        BINGET     5
    -    160: \x86     TUPLE2
    -    161: Q        BINPERSID
    -    162: U        SHORT_BINSTRING 'g'
    -    165: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x03'
    -    175: h        BINGET     5
    -    177: \x86     TUPLE2
    -    178: Q        BINPERSID
    -    179: U        SHORT_BINSTRING 'f'
    -    182: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x01'
    -    192: h        BINGET     5
    -    194: \x86     TUPLE2
    -    195: Q        BINPERSID
    -    196: u        SETITEMS   (MARK at 59)
    -    197: s    SETITEM
    -    198: .    STOP
    +     46: q    BINPUT     1
    +     48: X    BINUNICODE 'data'
    +     57: q    BINPUT     2
    +     59: }    EMPTY_DICT
    +     60: q    BINPUT     3
    +     62: (    MARK
    +     63: X        BINUNICODE 'f'
    +     69: q        BINPUT     4
    +     71: C        SHORT_BINBYTES b'\x00\x00\x00\x00\x00\x00\x00\x01'
    +     81: q        BINPUT     5
    +     83: c        GLOBAL     '__main__ Object'
    +    100: q        BINPUT     6
    +    102: \x86     TUPLE2
    +    103: q        BINPUT     7
    +    105: Q        BINPERSID
    +    106: X        BINUNICODE 'd'
    +    112: q        BINPUT     8
    +    114: C        SHORT_BINBYTES b'\x00\x00\x00\x00\x00\x00\x00\x02'
    +    124: q        BINPUT     9
    +    126: h        BINGET     6
    +    128: \x86     TUPLE2
    +    129: q        BINPUT     10
    +    131: Q        BINPERSID
    +    132: X        BINUNICODE 'g'
    +    138: q        BINPUT     11
    +    140: C        SHORT_BINBYTES b'\x00\x00\x00\x00\x00\x00\x00\x03'
    +    150: q        BINPUT     12
    +    152: h        BINGET     6
    +    154: \x86     TUPLE2
    +    155: q        BINPUT     13
    +    157: Q        BINPERSID
    +    158: X        BINUNICODE 'b'
    +    164: q        BINPUT     14
    +    166: C        SHORT_BINBYTES b'\x00\x00\x00\x00\x00\x00\x00\x08'
    +    176: q        BINPUT     15
    +    178: h        BINGET     6
    +    180: \x86     TUPLE2
    +    181: q        BINPUT     16
    +    183: Q        BINPERSID
    +    184: X        BINUNICODE 'a'
    +    190: q        BINPUT     17
    +    192: C        SHORT_BINBYTES b'\x00\x00\x00\x00\x00\x00\x00\x05'
    +    202: q        BINPUT     18
    +    204: h        BINGET     6
    +    206: \x86     TUPLE2
    +    207: q        BINPUT     19
    +    209: Q        BINPERSID
    +    210: X        BINUNICODE 'e'
    +    216: q        BINPUT     20
    +    218: C        SHORT_BINBYTES b'\x00\x00\x00\x00\x00\x00\x00\x06'
    +    228: q        BINPUT     21
    +    230: h        BINGET     6
    +    232: \x86     TUPLE2
    +    233: q        BINPUT     22
    +    235: Q        BINPERSID
    +    236: X        BINUNICODE 'c'
    +    242: q        BINPUT     23
    +    244: C        SHORT_BINBYTES b'\x00\x00\x00\x00\x00\x00\x00\x07'
    +    254: q        BINPUT     24
    +    256: h        BINGET     6
    +    258: \x86     TUPLE2
    +    259: q        BINPUT     25
    +    261: Q        BINPERSID
    +    262: u        SETITEMS   (MARK at 62)
    +    263: s    SETITEM
    +    264: .    STOP
       highest protocol among opcodes = 3

    -obj 0000000000000008 32 sha1:dfe254b2f091cf0c9bc835713d53012d44e7e7ca
    +obj 0000000000000008 35 sha1:70dc33558d26431f1d6dbd576cf4b677032c97fd
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'b0*'
    -     29: q    BINPUT     2
    -     31: .    STOP
    +     24: X    BINUNICODE 'b0*'
    +     32: q    BINPUT     1
    +     34: .    STOP
       highest protocol among opcodes = 2

    @@ -176,16 +197,16 @@ txn 0285cbad02222280 " "
     user "user1.0"
     description "step 1.0"
     extension ""
    -obj 0000000000000006 33 sha1:8f86d80dab366ac9780cdf9fd11aa622364397db
    +obj 0000000000000006 36 sha1:fc39de2e2d959f996fc80c1f8fa58fd8584e9bd6
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'e1.0'
    -     30: q    BINPUT     2
    -     32: .    STOP
    +     24: X    BINUNICODE 'e1.0'
    +     33: q    BINPUT     1
    +     35: .    STOP
       highest protocol among opcodes = 2

    @@ -193,16 +214,16 @@ txn 0285cbad06d3a0cc " "
     user "user1.1"
     description "step 1.1"
     extension ""
    -obj 0000000000000008 33 sha1:3a63a76c25b677ada2cc1281f0fcbca823c2fde8
    +obj 0000000000000008 36 sha1:48ceba60e193e905cb25a4e452bacbfba1e6f54a
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'b1.1'
    -     30: q    BINPUT     2
    -     32: .    STOP
    +     24: X    BINUNICODE 'b1.1'
    +     33: q    BINPUT     1
    +     35: .    STOP
       highest protocol among opcodes = 2

    @@ -210,16 +231,16 @@ txn 0285cbad0b851f19 " "
     user "user1.2"
     description "step 1.2"
     extension ""
    -obj 0000000000000003 33 sha1:c13b686e24c0b49869156feaafa5299a0be0db54
    +obj 0000000000000003 36 sha1:5484c69f420ce2bc74798fa0af92cad1fff46ac5
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'g1.2'
    -     30: q    BINPUT     2
    -     32: .    STOP
    +     24: X    BINUNICODE 'g1.2'
    +     33: q    BINPUT     1
    +     35: .    STOP
       highest protocol among opcodes = 2

    @@ -227,16 +248,16 @@ txn 0285cbad10369d66 " "
     user "user1.3"
     description "step 1.3"
     extension ""
    -obj 0000000000000003 33 sha1:edbfe9c47fdfd3eeb89578d2b975196b72e04a47
    +obj 0000000000000003 36 sha1:c58b6020a7991c2b763ad922d1a9ae93f341883b
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'g1.3'
    -     30: q    BINPUT     2
    -     32: .    STOP
    +     24: X    BINUNICODE 'g1.3'
    +     33: q    BINPUT     1
    +     35: .    STOP
       highest protocol among opcodes = 2

    @@ -244,16 +265,16 @@ txn 0285cbad14e81bb3 " "
     user "user1.4"
     description "step 1.4"
     extension ""
    -obj 0000000000000007 33 sha1:0ce3b56cc68602d8fcf9633527fc02d68d3c7963
    +obj 0000000000000007 36 sha1:a074839c67efb6d96e1d4400691bdb58e0b3ca43
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'c1.4'
    -     30: q    BINPUT     2
    -     32: .    STOP
    +     24: X    BINUNICODE 'c1.4'
    +     33: q    BINPUT     1
    +     35: .    STOP
       highest protocol among opcodes = 2

    @@ -261,16 +282,16 @@ txn 0285cbad19999a00 " "
     user "user1.5"
     description "step 1.5"
     extension ""
    -obj 0000000000000001 33 sha1:9bb04c55d1990c274fcc9f6d71701456c999154d
    +obj 0000000000000001 36 sha1:6718431686e2413a926aa146c76ef3007de9d39b
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'f1.5'
    -     30: q    BINPUT     2
    -     32: .    STOP
    +     24: X    BINUNICODE 'f1.5'
    +     33: q    BINPUT     1
    +     35: .    STOP
       highest protocol among opcodes = 2

    @@ -278,16 +299,16 @@ txn 0285cbad1e4b184c " "
     user "user1.6"
     description "step 1.6"
     extension ""
    -obj 0000000000000002 33 sha1:3856df32ef7c512e9fd2599772e431ce3a18b5f5
    +obj 0000000000000002 36 sha1:9cb878d16cc4c0968eb9942b45d7c7f84b2054ef
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'd1.6'
    -     30: q    BINPUT     2
    -     32: .    STOP
    +     24: X    BINUNICODE 'd1.6'
    +     33: q    BINPUT     1
    +     35: .    STOP
       highest protocol among opcodes = 2

    @@ -295,16 +316,16 @@ txn 0285cbad22fc9699 " "
     user "user1.7"
     description "step 1.7"
     extension ""
    -obj 0000000000000007 33 sha1:3d9da3b8f59a10f15e7c6796023153089d58d969
    +obj 0000000000000007 36 sha1:bc53969fc907268a68ab4e9c601e114157a6b7ed
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'c1.7'
    -     30: q    BINPUT     2
    -     32: .    STOP
    +     24: X    BINUNICODE 'c1.7'
    +     33: q    BINPUT     1
    +     35: .    STOP
       highest protocol among opcodes = 2

    @@ -312,16 +333,16 @@ txn 0285cbad27ae14e6 " "
     user "user1.8"
     description "step 1.8"
     extension ""
    -obj 0000000000000007 33 sha1:42c7e6fe473e6d99867b134c44c2d97813629b29
    +obj 0000000000000007 36 sha1:bb7b95b7f8cfcb61b5a19f646a9f54b05d445823
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'c1.8'
    -     30: q    BINPUT     2
    -     32: .    STOP
    +     24: X    BINUNICODE 'c1.8'
    +     33: q    BINPUT     1
    +     35: .    STOP
       highest protocol among opcodes = 2

    @@ -329,16 +350,16 @@ txn 0285cbad2c5f9333 " "
     user "user1.9"
     description "step 1.9"
     extension ""
    -obj 0000000000000006 33 sha1:88921e4828cbbf11dc61ca6fbaf6595a88fe5076
    +obj 0000000000000006 36 sha1:e592ee7c81df854144e95f6a770786865a0d58d5
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'e1.9'
    -     30: q    BINPUT     2
    -     32: .    STOP
    +     24: X    BINUNICODE 'e1.9'
    +     33: q    BINPUT     1
    +     35: .    STOP
       highest protocol among opcodes = 2

    @@ -346,16 +367,16 @@ txn 0285cbad31111180 " "
     user "user1.10"
     description "step 1.10"
     extension ""
    -obj 0000000000000005 34 sha1:70fe501d55fc4052b73f5e3473262a48555f375f
    +obj 0000000000000005 37 sha1:b2976e8cc01b2c9914b396cd6d3fdb49b0488856
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'a1.10'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'a1.10'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -363,16 +384,16 @@ txn 0285cbad35c28fcc " "
     user "user1.11"
     description "step 1.11"
     extension ""
    -obj 0000000000000007 34 sha1:f1550b205f2cec40b8716673663fb6e446568772
    +obj 0000000000000007 37 sha1:6e4a4cf52bb36edaa083b1da4b59f3597ad6ea02
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'c1.11'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'c1.11'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -380,16 +401,16 @@ txn 0285cbad3a740e19 " "
     user "user1.12"
     description "step 1.12"
     extension ""
    -obj 0000000000000006 34 sha1:e4587785ac67a316d288d89a2ecf5f7548804416
    +obj 0000000000000006 37 sha1:fad24b6d7758e671a255810ead8994459e9b0417
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'e1.12'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'e1.12'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -397,16 +418,16 @@ txn 0285cbad3f258c66 " "
     user "user1.13"
     description "step 1.13"
     extension ""
    -obj 0000000000000003 34 sha1:c40d417ad5140d3c0a76b8119e1bc3f77924851f
    +obj 0000000000000003 37 sha1:be8b8aacb1e6b6e4661a96fe6f741ddc653acc41
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'g1.13'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'g1.13'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -414,16 +435,16 @@ txn 0285cbad43d70ab3 " "
     user "user1.14"
     description "step 1.14"
     extension ""
    -obj 0000000000000003 34 sha1:141ee9a480f2e04c1c2b9fab6cab263010ab32cd
    +obj 0000000000000003 37 sha1:c65e91e03c291d0082a6ea58c9082e29b9f28c55
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'g1.14'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'g1.14'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -431,16 +452,16 @@ txn 0285cbad48888900 " "
     user "user1.15"
     description "step 1.15"
     extension ""
    -obj 0000000000000002 34 sha1:ffd9e2447b4d6230d8e4c6584967ebd45bdb69cd
    +obj 0000000000000002 37 sha1:8b850edece74832eb6ff1e4be78b05f52ef5609c
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'd1.15'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'd1.15'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -448,16 +469,16 @@ txn 0285cbad4d3a074c " "
     user "user1.16"
     description "step 1.16"
     extension ""
    -obj 0000000000000003 34 sha1:e320d84b1e6f9b5507665684c57938c97fb8707a
    +obj 0000000000000003 37 sha1:9480ee152fd13794009dd03d188cf82ec9fb4819
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'g1.16'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'g1.16'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -465,16 +486,16 @@ txn 0285cbad51eb8599 " "
     user "user1.17"
     description "step 1.17"
     extension ""
    -obj 0000000000000001 34 sha1:a64a2fa4d8de13124ad15958bb44e93bb50be691
    +obj 0000000000000001 37 sha1:ee2d6c62270d71f460cfbe50c25c4558f2e4db96
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'f1.17'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'f1.17'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -482,16 +503,16 @@ txn 0285cbad569d03e6 " "
     user "user1.18"
     description "step 1.18"
     extension ""
    -obj 0000000000000005 34 sha1:1a13c223b1e3c4336157bd9ea48bcebbf2bfeb83
    +obj 0000000000000005 37 sha1:aabc707728e1624e47e00b44c0536837c138f6e9
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'a1.18'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'a1.18'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -499,16 +520,16 @@ txn 0285cbad5b4e8233 " "
     user "user1.19"
     description "step 1.19"
     extension ""
    -obj 0000000000000003 34 sha1:a0b9f323870e42230530e88c3d0df4d0ff53d169
    +obj 0000000000000003 37 sha1:ea6e91b0041c018c8c77ebe55596fb44593396a5
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'g1.19'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'g1.19'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -516,16 +537,16 @@ txn 0285cbad60000080 " "
     user "user1.20"
     description "step 1.20"
     extension ""
    -obj 0000000000000003 34 sha1:9d877b2756905d307e10300aa81428ea05c630d2
    +obj 0000000000000003 37 sha1:2edb6e67e9c1d0c0dd7c4bf008c81ebcf16fe0b7
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'g1.20'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'g1.20'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -533,16 +554,16 @@ txn 0285cbad64b17ecc " "
     user "user1.21"
     description "step 1.21"
     extension ""
    -obj 0000000000000006 34 sha1:4087f3ba62712e5c29b0d861d65bcc9904f0828e
    +obj 0000000000000006 37 sha1:39f276b08f1dbe1c10d8d78fbbb2b56a8adf47bc
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'e1.21'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'e1.21'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -550,16 +571,16 @@ txn 0285cbad6962fd19 " "
     user "user1.22"
     description "step 1.22"
     extension ""
    -obj 0000000000000005 34 sha1:7f234b2ebf6c51bbc2acf55bc481b8ca0912b088
    +obj 0000000000000005 37 sha1:da8d342e0f80ea707724e47afc06640ab2d5a91b
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'a1.22'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'a1.22'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -567,16 +588,16 @@ txn 0285cbad6e147b66 " "
     user "user1.23"
     description "step 1.23"
     extension ""
    -obj 0000000000000005 34 sha1:b54c8d6f9415eef59c5e4598d4ea459c7def7ae5
    +obj 0000000000000005 37 sha1:97ab286d00da92b84ccf43ead31cd607bf847e6d
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'a1.23'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'a1.23'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -584,16 +605,16 @@ txn 0285cbad72c5f9b3 " "
     user "user1.24"
     description "step 1.24"
     extension ""
    -obj 0000000000000001 34 sha1:fc513f6a915be326a3d1212b12b389f284a329b2
    +obj 0000000000000001 37 sha1:fdb7cbf61232f415712183ed09075677d401141f
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'f1.24'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'f1.24'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -613,18 +634,20 @@ txn 0285cbad80da7499 " "
     user "user"
     description "cyclic reference"
     extension ""
    -obj 0000000000000006 39 sha1:baf12eac4d077427f66ff902f64d44a2a141bfd6
    +obj 0000000000000006 43 sha1:983e0d4ef28b594823f7279d8c08d998930d1ff8
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: C    SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x06'
    -     34: h    BINGET     1
    -     36: \x86 TUPLE2
    -     37: Q    BINPERSID
    -     38: .    STOP
    +     24: C    SHORT_BINBYTES b'\x00\x00\x00\x00\x00\x00\x00\x06'
    +     34: q    BINPUT     1
    +     36: h    BINGET     0
    +     38: \x86 TUPLE2
    +     39: q    BINPUT     2
    +     41: Q    BINPERSID
    +     42: .    STOP
       highest protocol among opcodes = 3

    @@ -632,71 +655,92 @@ txn 0285cbad858bf2e6 " "
     user ""
     description "predelete 6"
     extension ""
    -obj 0000000000000000 199 sha1:eaa0f1b643468f33c6b87a875d67eb3b349be5dd
    +obj 0000000000000000 265 sha1:78b3f0aaef3a8674a55a61e9693b4b0443316bc9
           0: \x80 PROTO      3
           2: c    GLOBAL     'persistent.mapping PersistentMapping'
    -     40: q    BINPUT     1
    +     40: q    BINPUT     0
          42: .    STOP
       highest protocol among opcodes = 2
          43: \x80 PROTO      3
          45: }    EMPTY_DICT
    -     46: q    BINPUT     2
    -     48: U    SHORT_BINSTRING 'data'
    -     54: q    BINPUT     3
    -     56: }    EMPTY_DICT
    -     57: q    BINPUT     4
    -     59: (    MARK
    -     60: U        SHORT_BINSTRING 'a'
    -     63: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x05'
    -     73: c        GLOBAL     '__main__ Object'
    -     90: q        BINPUT     5
    -     92: \x86     TUPLE2
    -     93: Q        BINPERSID
    -     94: U        SHORT_BINSTRING 'c'
    -     97: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x07'
    -    107: h        BINGET     5
    -    109: \x86     TUPLE2
    -    110: Q        BINPERSID
    -    111: U        SHORT_BINSTRING 'b'
    -    114: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x08'
    -    124: h        BINGET     5
    -    126: \x86     TUPLE2
    -    127: Q        BINPERSID
    -    128: U        SHORT_BINSTRING 'e'
    -    131: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\t'
    -    141: h        BINGET     5
    -    143: \x86     TUPLE2
    -    144: Q        BINPERSID
    -    145: U        SHORT_BINSTRING 'd'
    -    148: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x02'
    -    158: h        BINGET     5
    -    160: \x86     TUPLE2
    -    161: Q        BINPERSID
    -    162: U        SHORT_BINSTRING 'g'
    -    165: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x03'
    -    175: h        BINGET     5
    -    177: \x86     TUPLE2
    -    178: Q        BINPERSID
    -    179: U        SHORT_BINSTRING 'f'
    -    182: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x01'
    -    192: h        BINGET     5
    -    194: \x86     TUPLE2
    -    195: Q        BINPERSID
    -    196: u        SETITEMS   (MARK at 59)
    -    197: s    SETITEM
    -    198: .    STOP
    +     46: q    BINPUT     1
    +     48: X    BINUNICODE 'data'
    +     57: q    BINPUT     2
    +     59: }    EMPTY_DICT
    +     60: q    BINPUT     3
    +     62: (    MARK
    +     63: X        BINUNICODE 'f'
    +     69: q        BINPUT     4
    +     71: C        SHORT_BINBYTES b'\x00\x00\x00\x00\x00\x00\x00\x01'
    +     81: q        BINPUT     5
    +     83: c        GLOBAL     '__main__ Object'
    +    100: q        BINPUT     6
    +    102: \x86     TUPLE2
    +    103: q        BINPUT     7
    +    105: Q        BINPERSID
    +    106: X        BINUNICODE 'd'
    +    112: q        BINPUT     8
    +    114: C        SHORT_BINBYTES b'\x00\x00\x00\x00\x00\x00\x00\x02'
    +    124: q        BINPUT     9
    +    126: h        BINGET     6
    +    128: \x86     TUPLE2
    +    129: q        BINPUT     10
    +    131: Q        BINPERSID
    +    132: X        BINUNICODE 'g'
    +    138: q        BINPUT     11
    +    140: C        SHORT_BINBYTES b'\x00\x00\x00\x00\x00\x00\x00\x03'
    +    150: q        BINPUT     12
    +    152: h        BINGET     6
    +    154: \x86     TUPLE2
    +    155: q        BINPUT     13
    +    157: Q        BINPERSID
    +    158: X        BINUNICODE 'b'
    +    164: q        BINPUT     14
    +    166: C        SHORT_BINBYTES b'\x00\x00\x00\x00\x00\x00\x00\x08'
    +    176: q        BINPUT     15
    +    178: h        BINGET     6
    +    180: \x86     TUPLE2
    +    181: q        BINPUT     16
    +    183: Q        BINPERSID
    +    184: X        BINUNICODE 'a'
    +    190: q        BINPUT     17
    +    192: C        SHORT_BINBYTES b'\x00\x00\x00\x00\x00\x00\x00\x05'
    +    202: q        BINPUT     18
    +    204: h        BINGET     6
    +    206: \x86     TUPLE2
    +    207: q        BINPUT     19
    +    209: Q        BINPERSID
    +    210: X        BINUNICODE 'e'
    +    216: q        BINPUT     20
    +    218: C        SHORT_BINBYTES b'\x00\x00\x00\x00\x00\x00\x00\t'
    +    228: q        BINPUT     21
    +    230: h        BINGET     6
    +    232: \x86     TUPLE2
    +    233: q        BINPUT     22
    +    235: Q        BINPERSID
    +    236: X        BINUNICODE 'c'
    +    242: q        BINPUT     23
    +    244: C        SHORT_BINBYTES b'\x00\x00\x00\x00\x00\x00\x00\x07'
    +    254: q        BINPUT     24
    +    256: h        BINGET     6
    +    258: \x86     TUPLE2
    +    259: q        BINPUT     25
    +    261: Q        BINPERSID
    +    262: u        SETITEMS   (MARK at 62)
    +    263: s    SETITEM
    +    264: .    STOP
       highest protocol among opcodes = 3

    -obj 0000000000000009 32 sha1:c10d44876cbf78e49f7cc633d985206f51ecc278
    +obj 0000000000000009 35 sha1:4b20bfd26d2807d81c4c52b56034203b96babe5d
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'e1*'
    -     29: q    BINPUT     2
    -     31: .    STOP
    +     24: X    BINUNICODE 'e1*'
    +     32: q    BINPUT     1
    +     34: .    STOP
       highest protocol among opcodes = 2

    @@ -710,16 +754,16 @@ txn 0285cbadc740db19 " "
     user "user2.0"
     description "step 2.0"
     extension ""
    -obj 0000000000000001 33 sha1:118c46c51bb0f08ce76d8f4f3b5d923b81abdd46
    +obj 0000000000000001 36 sha1:4698f11fc85b9eadd355d8114ed6f55b71377024
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'f2.0'
    -     30: q    BINPUT     2
    -     32: .    STOP
    +     24: X    BINUNICODE 'f2.0'
    +     33: q    BINPUT     1
    +     35: .    STOP
       highest protocol among opcodes = 2

    @@ -727,16 +771,16 @@ txn 0285cbadcbf25966 " "
     user "user2.1"
     description "step 2.1"
     extension ""
    -obj 0000000000000002 33 sha1:89ff5e4440585130863b518c044d35e0154daecc
    +obj 0000000000000002 36 sha1:e2f891ce328ae3ae117d22649af0da7cd0b1946d
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'd2.1'
    -     30: q    BINPUT     2
    -     32: .    STOP
    +     24: X    BINUNICODE 'd2.1'
    +     33: q    BINPUT     1
    +     35: .    STOP
       highest protocol among opcodes = 2

    @@ -744,16 +788,16 @@ txn 0285cbadd0a3d7b3 " "
     user "user2.2"
     description "step 2.2"
     extension ""
    -obj 0000000000000003 33 sha1:e0470e3dee47625819f9bfe8085c1bce2a7a4a42
    +obj 0000000000000003 36 sha1:d1df41d00d4a274b872cc3a461c0e817a56891e8
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'g2.2'
    -     30: q    BINPUT     2
    -     32: .    STOP
    +     24: X    BINUNICODE 'g2.2'
    +     33: q    BINPUT     1
    +     35: .    STOP
       highest protocol among opcodes = 2

    @@ -761,16 +805,16 @@ txn 0285cbadd5555600 " "
     user "user2.3"
     description "step 2.3"
     extension ""
    -obj 0000000000000003 33 sha1:b1a3740b05c6cae5f6c851b715c76dd7348228a9
    +obj 0000000000000003 36 sha1:94f3e65e39ff51d57f15d484211b9b14cc764dc9
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'g2.3'
    -     30: q    BINPUT     2
    -     32: .    STOP
    +     24: X    BINUNICODE 'g2.3'
    +     33: q    BINPUT     1
    +     35: .    STOP
       highest protocol among opcodes = 2

    @@ -778,16 +822,16 @@ txn 0285cbadda06d44c " "
     user "user2.4"
     description "step 2.4"
     extension ""
    -obj 0000000000000009 33 sha1:d0368e87213747ab68d8e4f7a87ff1ea959ea579
    +obj 0000000000000009 36 sha1:ee33bb85a5d8eedd010f1353a12710f19164e039
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'e2.4'
    -     30: q    BINPUT     2
    -     32: .    STOP
    +     24: X    BINUNICODE 'e2.4'
    +     33: q    BINPUT     1
    +     35: .    STOP
       highest protocol among opcodes = 2

    @@ -795,16 +839,16 @@ txn 0285cbaddeb85299 " "
     user "user2.5"
     description "step 2.5"
     extension ""
    -obj 0000000000000005 33 sha1:e5af7f0b8e157926739f657e729594908d188a3d
    +obj 0000000000000005 36 sha1:c772534529d247cfc1b9fdf5a6af0e6d209718f5
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'a2.5'
    -     30: q    BINPUT     2
    -     32: .    STOP
    +     24: X    BINUNICODE 'a2.5'
    +     33: q    BINPUT     1
    +     35: .    STOP
       highest protocol among opcodes = 2

    @@ -812,16 +856,16 @@ txn 0285cbade369d0e6 " "
     user "user2.6"
     description "step 2.6"
     extension ""
    -obj 0000000000000008 33 sha1:dc70c3b1413c79d75bcfdcc50c3e803273f857ef
    +obj 0000000000000008 36 sha1:100e5baf3b5cf7276d7657e7ebe515e4444be00a
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'b2.6'
    -     30: q    BINPUT     2
    -     32: .    STOP
    +     24: X    BINUNICODE 'b2.6'
    +     33: q    BINPUT     1
    +     35: .    STOP
       highest protocol among opcodes = 2

    @@ -829,16 +873,16 @@ txn 0285cbade81b4f33 " "
     user "user2.7"
     description "step 2.7"
     extension ""
    -obj 0000000000000003 33 sha1:35892bc2c71edb022b029aa1e4bf8201ccab4b0c
    +obj 0000000000000003 36 sha1:6982830f7f9ec7f5c71c2926dffc85003463365f
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'g2.7'
    -     30: q    BINPUT     2
    -     32: .    STOP
    +     24: X    BINUNICODE 'g2.7'
    +     33: q    BINPUT     1
    +     35: .    STOP
       highest protocol among opcodes = 2

    @@ -846,16 +890,16 @@ txn 0285cbadeccccd80 " "
     user "user2.8"
     description "step 2.8"
     extension ""
    -obj 0000000000000002 33 sha1:b2da174266d0f0e0b58c214e6d79851f4a18b554
    +obj 0000000000000002 36 sha1:679994a2775668088af510d185f118a6de678e9b
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'd2.8'
    -     30: q    BINPUT     2
    -     32: .    STOP
    +     24: X    BINUNICODE 'd2.8'
    +     33: q    BINPUT     1
    +     35: .    STOP
       highest protocol among opcodes = 2

    @@ -863,16 +907,16 @@ txn 0285cbadf17e4bcc " "
     user "user2.9"
     description "step 2.9"
     extension ""
    -obj 0000000000000009 33 sha1:92cf61eb5855d3b25fecbe7a458f1b21946f5ba3
    +obj 0000000000000009 36 sha1:7926589c9adf282a8de6ec2d2da7aeeb054db0e8
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'e2.9'
    -     30: q    BINPUT     2
    -     32: .    STOP
    +     24: X    BINUNICODE 'e2.9'
    +     33: q    BINPUT     1
    +     35: .    STOP
       highest protocol among opcodes = 2

    @@ -880,16 +924,16 @@ txn 0285cbadf62fca19 " "
     user "user2.10"
     description "step 2.10"
     extension ""
    -obj 0000000000000007 34 sha1:f737655162c594cf8296b38f7c435a5e8e06d6d7
    +obj 0000000000000007 37 sha1:230ddb4fcd957487b06a9a6690d0085a5f4e447f
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'c2.10'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'c2.10'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -897,16 +941,16 @@ txn 0285cbadfae14866 " "
     user "user2.11"
     description "step 2.11"
     extension ""
    -obj 0000000000000002 34 sha1:032d8305ea9de2ec785fc77c1743a37bb64553cd
    +obj 0000000000000002 37 sha1:c85a70f3ee80af026ffd7392402efd62e8dbd807
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'd2.11'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'd2.11'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -914,16 +958,16 @@ txn 0285cbadff92c6b3 " "
     user "user2.12"
     description "step 2.12"
     extension ""
    -obj 0000000000000003 34 sha1:975fd7ef6350b6543495a800852969f1d7833c83
    +obj 0000000000000003 37 sha1:f447a42edf90ac9ef506f55e3f2af240f52d84d7
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'g2.12'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'g2.12'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -931,16 +975,16 @@ txn 0285cbae04444500 " "
     user "user2.13"
     description "step 2.13"
     extension ""
    -obj 0000000000000002 34 sha1:d09e49d753b8183ba5e0fa042a239f103d54c873
    +obj 0000000000000002 37 sha1:92783aa30a97637bfa75bb74ee4188163e6599bb
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'd2.13'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'd2.13'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -948,16 +992,16 @@ txn 0285cbae08f5c34c " "
     user "user2.14"
     description "step 2.14"
     extension ""
    -obj 0000000000000007 34 sha1:109581582c53bf400e56780c331410e5195d19e0
    +obj 0000000000000007 37 sha1:26e44812ce9f495bdc79426a987f86514576702b
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'c2.14'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'c2.14'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -965,16 +1009,16 @@ txn 0285cbae0da74199 " "
     user "user2.15"
     description "step 2.15"
     extension ""
    -obj 0000000000000009 34 sha1:e67485cd99587ee9e98158db69ed668fb233093d
    +obj 0000000000000009 37 sha1:5036c79c841dfde65e56cf5ff9d5765ab025a8e8
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'e2.15'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'e2.15'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -982,16 +1026,16 @@ txn 0285cbae1258bfe6 " "
     user "user2.16"
     description "step 2.16"
     extension ""
    -obj 0000000000000001 34 sha1:b9f373fb2097836edf1c9ffbf0ca55d1d2b2168f
    +obj 0000000000000001 37 sha1:a89f350d69c3f1ef8d7f2893d25ddbca59c72c1d
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'f2.16'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'f2.16'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -999,16 +1043,16 @@ txn 0285cbae170a3e33 " "
     user "user2.17"
     description "step 2.17"
     extension ""
    -obj 0000000000000008 34 sha1:698e7a066839a9436339747fe7a85f475095af67
    +obj 0000000000000008 37 sha1:a442c267648c2cdcc7bd94e9343ae3c40bfd4aa1
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'b2.17'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'b2.17'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -1016,16 +1060,16 @@ txn 0285cbae1bbbbc80 " "
     user "user2.18"
     description "step 2.18"
     extension ""
    -obj 0000000000000002 34 sha1:0d2f350bbfeb38c85466b05b336f9414b9e91f77
    +obj 0000000000000002 37 sha1:4751d47156d33d3029b1ac072978a0cd036d8407
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'd2.18'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'd2.18'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -1033,16 +1077,16 @@ txn 0285cbae206d3acc " "
     user "user2.19"
     description "step 2.19"
     extension ""
    -obj 0000000000000009 34 sha1:471ca065c05720073421a0aeab549cb1e58cf99f
    +obj 0000000000000009 37 sha1:2c45fb767784e729381e26b159809465de6cc4a1
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'e2.19'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'e2.19'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -1050,16 +1094,16 @@ txn 0285cbae251eb919 " "
     user "user2.20"
     description "step 2.20"
     extension ""
    -obj 0000000000000008 34 sha1:3b543565ce78028b7118f322a8d1faf2439d70e4
    +obj 0000000000000008 37 sha1:805076196578ebe4b4d399791a0841210348b7dd
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'b2.20'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'b2.20'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -1067,16 +1111,16 @@ txn 0285cbae29d03766 " "
     user "user2.21"
     description "step 2.21"
     extension ""
    -obj 0000000000000009 34 sha1:79714405c7319c5800c2fe5f192a8a1e8a33d873
    +obj 0000000000000009 37 sha1:67fe19d4814705a72c5213d7b9827d60211f955e
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'e2.21'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'e2.21'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -1084,16 +1128,16 @@ txn 0285cbae2e81b5b3 " "
     user "user2.22"
     description "step 2.22"
     extension ""
    -obj 0000000000000009 34 sha1:fb3f01b3470c5dcf9b4ce613bdd3821f2b9a3576
    +obj 0000000000000009 37 sha1:1467daccd50741b009135ca01fa4b1d5603cf52b
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'e2.22'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'e2.22'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -1101,16 +1145,16 @@ txn 0285cbae33333400 " "
     user "user2.23"
     description "step 2.23"
     extension ""
    -obj 0000000000000002 34 sha1:2a646981c19fe36d62d89df7e1fd344eb648f9b8
    +obj 0000000000000002 37 sha1:414bbf42bc2c71670db19a00326a66ae81c95934
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'd2.23'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'd2.23'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -1118,16 +1162,16 @@ txn 0285cbae37e4b24c " "
     user "user2.24"
     description "step 2.24"
     extension ""
    -obj 0000000000000009 34 sha1:8b769601aed2ebd9f3cc8fe1e63b2cd8975f9f2d
    +obj 0000000000000009 37 sha1:5bebc2493258962bc7b04ac95adf0753a48717c6
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'e2.24'
    -     31: q    BINPUT     2
    -     33: .    STOP
    +     24: X    BINUNICODE 'e2.24'
    +     34: q    BINPUT     1
    +     36: .    STOP
       highest protocol among opcodes = 2

    @@ -1147,18 +1191,20 @@ txn 0285cbae45f92d33 " "
     user "user"
     description "cyclic reference"
     extension ""
    -obj 0000000000000002 39 sha1:f44b22761c7e1df86ed61823eb1404e463378a32
    +obj 0000000000000002 43 sha1:5dbee843010481bc9decea7a3fdc788af687a861
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: C    SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x02'
    -     34: h    BINGET     1
    -     36: \x86 TUPLE2
    -     37: Q    BINPERSID
    -     38: .    STOP
    +     24: C    SHORT_BINBYTES b'\x00\x00\x00\x00\x00\x00\x00\x02'
    +     34: q    BINPUT     1
    +     36: h    BINGET     0
    +     38: \x86 TUPLE2
    +     39: q    BINPUT     2
    +     41: Q    BINPERSID
    +     42: .    STOP
       highest protocol among opcodes = 3

    @@ -1166,71 +1212,92 @@ txn 0285cbae4aaaab80 " "
     user ""
     description "predelete 2"
     extension ""
    -obj 0000000000000000 199 sha1:a51d894c29856c2e8b8194e714cd84a0a23d03b8
    +obj 0000000000000000 265 sha1:7e206c9b8e345ec231a691fa8e5570059f715c42
           0: \x80 PROTO      3
           2: c    GLOBAL     'persistent.mapping PersistentMapping'
    -     40: q    BINPUT     1
    +     40: q    BINPUT     0
          42: .    STOP
       highest protocol among opcodes = 2
          43: \x80 PROTO      3
          45: }    EMPTY_DICT
    -     46: q    BINPUT     2
    -     48: U    SHORT_BINSTRING 'data'
    -     54: q    BINPUT     3
    -     56: }    EMPTY_DICT
    -     57: q    BINPUT     4
    -     59: (    MARK
    -     60: U        SHORT_BINSTRING 'a'
    -     63: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x05'
    -     73: c        GLOBAL     '__main__ Object'
    -     90: q        BINPUT     5
    -     92: \x86     TUPLE2
    -     93: Q        BINPERSID
    -     94: U        SHORT_BINSTRING 'c'
    -     97: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x07'
    -    107: h        BINGET     5
    -    109: \x86     TUPLE2
    -    110: Q        BINPERSID
    -    111: U        SHORT_BINSTRING 'b'
    -    114: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x08'
    -    124: h        BINGET     5
    -    126: \x86     TUPLE2
    -    127: Q        BINPERSID
    -    128: U        SHORT_BINSTRING 'e'
    -    131: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\t'
    -    141: h        BINGET     5
    -    143: \x86     TUPLE2
    -    144: Q        BINPERSID
    -    145: U        SHORT_BINSTRING 'd'
    -    148: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\n'
    -    158: h        BINGET     5
    -    160: \x86     TUPLE2
    -    161: Q        BINPERSID
    -    162: U        SHORT_BINSTRING 'g'
    -    165: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x03'
    -    175: h        BINGET     5
    -    177: \x86     TUPLE2
    -    178: Q        BINPERSID
    -    179: U        SHORT_BINSTRING 'f'
    -    182: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x01'
    -    192: h        BINGET     5
    -    194: \x86     TUPLE2
    -    195: Q        BINPERSID
    -    196: u        SETITEMS   (MARK at 59)
    -    197: s    SETITEM
    -    198: .    STOP
    +     46: q    BINPUT     1
    +     48: X    BINUNICODE 'data'
    +     57: q    BINPUT     2
    +     59: }    EMPTY_DICT
    +     60: q    BINPUT     3
    +     62: (    MARK
    +     63: X        BINUNICODE 'f'
    +     69: q        BINPUT     4
    +     71: C        SHORT_BINBYTES b'\x00\x00\x00\x00\x00\x00\x00\x01'
    +     81: q        BINPUT     5
    +     83: c        GLOBAL     '__main__ Object'
    +    100: q        BINPUT     6
    +    102: \x86     TUPLE2
    +    103: q        BINPUT     7
    +    105: Q        BINPERSID
    +    106: X        BINUNICODE 'd'
    +    112: q        BINPUT     8
    +    114: C        SHORT_BINBYTES b'\x00\x00\x00\x00\x00\x00\x00\n'
    +    124: q        BINPUT     9
    +    126: h        BINGET     6
    +    128: \x86     TUPLE2
    +    129: q        BINPUT     10
    +    131: Q        BINPERSID
    +    132: X        BINUNICODE 'g'
    +    138: q        BINPUT     11
    +    140: C        SHORT_BINBYTES b'\x00\x00\x00\x00\x00\x00\x00\x03'
    +    150: q        BINPUT     12
    +    152: h        BINGET     6
    +    154: \x86     TUPLE2
    +    155: q        BINPUT     13
    +    157: Q        BINPERSID
    +    158: X        BINUNICODE 'b'
    +    164: q        BINPUT     14
    +    166: C        SHORT_BINBYTES b'\x00\x00\x00\x00\x00\x00\x00\x08'
    +    176: q        BINPUT     15
    +    178: h        BINGET     6
    +    180: \x86     TUPLE2
    +    181: q        BINPUT     16
    +    183: Q        BINPERSID
    +    184: X        BINUNICODE 'a'
    +    190: q        BINPUT     17
    +    192: C        SHORT_BINBYTES b'\x00\x00\x00\x00\x00\x00\x00\x05'
    +    202: q        BINPUT     18
    +    204: h        BINGET     6
    +    206: \x86     TUPLE2
    +    207: q        BINPUT     19
    +    209: Q        BINPERSID
    +    210: X        BINUNICODE 'e'
    +    216: q        BINPUT     20
    +    218: C        SHORT_BINBYTES b'\x00\x00\x00\x00\x00\x00\x00\t'
    +    228: q        BINPUT     21
    +    230: h        BINGET     6
    +    232: \x86     TUPLE2
    +    233: q        BINPUT     22
    +    235: Q        BINPERSID
    +    236: X        BINUNICODE 'c'
    +    242: q        BINPUT     23
    +    244: C        SHORT_BINBYTES b'\x00\x00\x00\x00\x00\x00\x00\x07'
    +    254: q        BINPUT     24
    +    256: h        BINGET     6
    +    258: \x86     TUPLE2
    +    259: q        BINPUT     25
    +    261: Q        BINPERSID
    +    262: u        SETITEMS   (MARK at 62)
    +    263: s    SETITEM
    +    264: .    STOP
       highest protocol among opcodes = 3

    -obj 000000000000000a 32 sha1:25364c8085cd5e554eb4756133186e5cf386032b
    +obj 000000000000000a 35 sha1:3c9779a0408ed164eca3ade755529246f25fe76c
           0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    +     19: q    BINPUT     0
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      3
    -     24: U    SHORT_BINSTRING 'd2*'
    -     29: q    BINPUT     2
    -     31: .    STOP
    +     24: X    BINUNICODE 'd2*'
    +     32: q    BINPUT     1
    +     34: .    STOP
       highest protocol among opcodes = 2

479c353d

test: Add py2py3-venv to combine two virtual environments into one · fac2f190

Kirill Smelkov authored Jul 16, 2024

Add script that can be used to combine python2 venv and python3 venv
into one environment where python2 refers to python interpreter with
access to eggs from py2 environment and python3 refers to python
interpreter with access to eggs from py3 environment.

In the next patch we will use this script to combine py2/py3 venvs into
one environment to run `python2 gen_testdata.py` and `python3
gen_testdata.py`. Though the script should be useful on its own to do
any combined py2/py3 work or testing.

fac2f190

test/*: Add py2 + pickle protocol=3 ZODB kind to test matrix · 09d79332

Kirill Smelkov authored Jul 16, 2024

This is the kind of databases that ZODB/py2 generates starting from ZODB
5.4, more specifically from https://github.com/zopefoundation/ZODB/commit/12ee41c4
done in 2018. In other words since 5-6 years ago this is the kind of
databases that are generated by default. Which means we should have test
coverage for this as well.

And adding this test coverage automatically reveals one bug in zodbdump:
its pretty=zpickledis mode used pickletools to dump content of pickles,
but since on py2 standard pickletools knows nothing about protocol=3
opcodes, that dump mode was failing on SHORT_BINBYTES ('C') opcode:

    kirr@deca:~/src/wendelin/z/zodbtools/zodbtools/test$ ./gen_testdata.py
    Traceback (most recent call last):
      File "./gen_testdata.py", line 392, in <module>
        main()
      File "./gen_testdata.py", line 388, in main
        run_with_all_zodb_pickle_kinds(_)
      File "./gen_testdata.py", line 190, in run_with_all_zodb_pickle_kinds
        _(3)
      File "./gen_testdata.py", line 187, in _
        f()
      File "./gen_testdata.py", line 376, in _
        zodbdump(stor, None, None, pretty=pretty, out=f)
      File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodbdump.py", line 169, in zodbdump
        pickletools.dis(dataf, disf, memo) # state
      File "/usr/lib/python2.7/pickletools.py", line 1933, in dis
        for opcode, arg, pos in genops(pickle):
      File "/usr/lib/python2.7/pickletools.py", line 1847, in genops
        code))
    ValueError: at position 63, opcode 'C' unknown

The fix is to use pickletools from zodbpickle instead of builtin
pickletools, and the fix needs to go in this patch as well because
otherwise it is not possible to generate the golden test files.

Inspecting the diff in between py2_pickle2 and py2_pickle3 one can see
that *BYTES opcodes start to be used for OIDs but otherwise test
database stays logically the same:

    (zdev+py39.env) kirr@deca:~/src/wendelin/z/zodbtools/zodbtools/test/testdata/1_!zext$ xdiff py2_pickle2/zdump.zpickledis.ok py2_pickle3/zdump.zpickledis.ok
    diff --git a/py2_pickle2/zdump.zpickledis.ok b/py2_pickle3/zdump.zpickledis.ok
    index 8586d39..cd9d7f5 100644
    --- a/py2_pickle2/zdump.zpickledis.ok
    +++ b/py2_pickle3/zdump.zpickledis.ok
    @@ -2,13 +2,13 @@ txn 0285cbac70a3d733 "p"
     user "user0.12"
     description "step 0.12"
     extension ""
    -obj 0000000000000001 34 sha1:9fae782fe3e33273b520c954925704856ca90dc6
    -      0: \x80 PROTO      2
    +obj 0000000000000001 34 sha1:fc9e49cca756681a9f36c915c6b7b8ad79f17cbc
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'f0.12'
          31: q    BINPUT     2
          33: .    STOP
    @@ -19,13 +19,13 @@ txn 0285cbac7eb85219 "p"
     user "user0.15"
     description "step 0.15"
     extension ""
    -obj 0000000000000006 34 sha1:5dbf26359289e5a25f9755f832ea91cc8ee76686
    -      0: \x80 PROTO      2
    +obj 0000000000000006 34 sha1:76a94af22a81cd970845aeb3536f428a96afcfc7
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'e0.15'
          31: q    BINPUT     2
          33: .    STOP
    @@ -36,13 +36,13 @@ txn 0285cbac917e4b4c "p"
     user "user0.19"
     description "step 0.19"
     extension ""
    -obj 0000000000000005 34 sha1:9e0a8797eb8f60498563703b1961126fba35be9b
    -      0: \x80 PROTO      2
    +obj 0000000000000005 34 sha1:4bd994052ba9a6b1f328c252d8766f13c53ae209
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'a0.19'
          31: q    BINPUT     2
          33: .    STOP
    @@ -53,13 +53,13 @@ txn 0285cbac9ae147e6 "p"
     user "user0.21"
     description "step 0.21"
     extension ""
    -obj 0000000000000002 34 sha1:009174c1f01142f24495fa13738749ff528fd82c
    -      0: \x80 PROTO      2
    +obj 0000000000000002 34 sha1:633b0e1e89447d452468367784717fb48b0b83b1
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'd0.21'
          31: q    BINPUT     2
          33: .    STOP
    @@ -70,13 +70,13 @@ txn 0285cbacada74119 "p"
     user "root0.0\nYour\nMagesty "
     description "undo 0.0\nmore detailed description\n\nzzz ..."
     extension ""
    -obj 0000000000000007 34 sha1:688eb65eab5e4c5ee5242b027bb9bfa5e1087598
    -      0: \x80 PROTO      2
    +obj 0000000000000007 34 sha1:b4bf7b467c62a1b51099ba1cc5b5aecd444d598d
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'c0.22'
          31: q    BINPUT     2
          33: .    STOP
    @@ -87,13 +87,13 @@ txn 0285cbacb258bf66 "p"
     user "root0.1\nYour\nMagesty "
     description "undo 0.1\nmore detailed description\n\nzzz ...\t"
     extension ""
    -obj 0000000000000003 34 sha1:484358413b2746e8a05b1e3173051abedd28e1fa
    -      0: \x80 PROTO      2
    +obj 0000000000000003 34 sha1:3e5f02a2aa5f0ea3747a6c0ffeec090654091583
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'g0.11'
          31: q    BINPUT     2
          33: .    STOP
    @@ -104,13 +104,13 @@ txn 0285cbacbbbbbc00 "p"
     user ""
     description "predelete 4"
     extension ""
    -obj 0000000000000000 213 sha1:a6e70638fafd4619841032356ae93a4da7b539c5
    -      0: \x80 PROTO      2
    +obj 0000000000000000 199 sha1:d9c10b69422e9a8279e2f738d9c270b88ee49861
    +      0: \x80 PROTO      3
           2: c    GLOBAL     'persistent.mapping PersistentMapping'
          40: q    BINPUT     1
          42: .    STOP
       highest protocol among opcodes = 2
    -     43: \x80 PROTO      2
    +     43: \x80 PROTO      3
          45: }    EMPTY_DICT
          46: q    BINPUT     2
          48: U    SHORT_BINSTRING 'data'
    @@ -119,60 +119,53 @@ obj 0000000000000000 213 sha1:a6e70638fafd4619841032356ae93a4da7b539c5
          57: q    BINPUT     4
          59: (    MARK
          60: U        SHORT_BINSTRING 'a'
    -     63: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x05'
    -     73: q        BINPUT     5
    -     75: c        GLOBAL     '__main__ Object'
    -     92: q        BINPUT     6
    -     94: \x86     TUPLE2
    -     95: Q        BINPERSID
    -     96: U        SHORT_BINSTRING 'c'
    -     99: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x07'
    -    109: q        BINPUT     7
    -    111: h        BINGET     6
    -    113: \x86     TUPLE2
    -    114: Q        BINPERSID
    -    115: U        SHORT_BINSTRING 'b'
    -    118: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x08'
    -    128: q        BINPUT     8
    -    130: h        BINGET     6
    -    132: \x86     TUPLE2
    -    133: Q        BINPERSID
    -    134: U        SHORT_BINSTRING 'e'
    -    137: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x06'
    -    147: q        BINPUT     9
    -    149: h        BINGET     6
    -    151: \x86     TUPLE2
    -    152: Q        BINPERSID
    -    153: U        SHORT_BINSTRING 'd'
    -    156: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x02'
    -    166: q        BINPUT     10
    -    168: h        BINGET     6
    -    170: \x86     TUPLE2
    -    171: Q        BINPERSID
    -    172: U        SHORT_BINSTRING 'g'
    -    175: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x03'
    -    185: q        BINPUT     11
    -    187: h        BINGET     6
    -    189: \x86     TUPLE2
    -    190: Q        BINPERSID
    -    191: U        SHORT_BINSTRING 'f'
    -    194: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x01'
    -    204: q        BINPUT     12
    -    206: h        BINGET     6
    -    208: \x86     TUPLE2
    -    209: Q        BINPERSID
    -    210: u        SETITEMS   (MARK at 59)
    -    211: s    SETITEM
    -    212: .    STOP
    -  highest protocol among opcodes = 2
    -
    -obj 0000000000000008 32 sha1:936674657cf846998d27356363832827fa612092
    -      0: \x80 PROTO      2
    +     63: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x05'
    +     73: c        GLOBAL     '__main__ Object'
    +     90: q        BINPUT     5
    +     92: \x86     TUPLE2
    +     93: Q        BINPERSID
    +     94: U        SHORT_BINSTRING 'c'
    +     97: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x07'
    +    107: h        BINGET     5
    +    109: \x86     TUPLE2
    +    110: Q        BINPERSID
    +    111: U        SHORT_BINSTRING 'b'
    +    114: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x08'
    +    124: h        BINGET     5
    +    126: \x86     TUPLE2
    +    127: Q        BINPERSID
    +    128: U        SHORT_BINSTRING 'e'
    +    131: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x06'
    +    141: h        BINGET     5
    +    143: \x86     TUPLE2
    +    144: Q        BINPERSID
    +    145: U        SHORT_BINSTRING 'd'
    +    148: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x02'
    +    158: h        BINGET     5
    +    160: \x86     TUPLE2
    +    161: Q        BINPERSID
    +    162: U        SHORT_BINSTRING 'g'
    +    165: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x03'
    +    175: h        BINGET     5
    +    177: \x86     TUPLE2
    +    178: Q        BINPERSID
    +    179: U        SHORT_BINSTRING 'f'
    +    182: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x01'
    +    192: h        BINGET     5
    +    194: \x86     TUPLE2
    +    195: Q        BINPERSID
    +    196: u        SETITEMS   (MARK at 59)
    +    197: s    SETITEM
    +    198: .    STOP
    +  highest protocol among opcodes = 3
    +
    +obj 0000000000000008 32 sha1:dfe254b2f091cf0c9bc835713d53012d44e7e7ca
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'b0*'
          29: q    BINPUT     2
          31: .    STOP
    @@ -183,13 +176,13 @@ txn 0285cbad02222280 " "
     user "user1.0"
     description "step 1.0"
     extension ""
    -obj 0000000000000006 33 sha1:f18e991b87b63cf1f9486d74d70020ff8d573eec
    -      0: \x80 PROTO      2
    +obj 0000000000000006 33 sha1:8f86d80dab366ac9780cdf9fd11aa622364397db
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'e1.0'
          30: q    BINPUT     2
          32: .    STOP
    @@ -200,13 +193,13 @@ txn 0285cbad06d3a0cc " "
     user "user1.1"
     description "step 1.1"
     extension ""
    -obj 0000000000000008 33 sha1:c37e1d2350c8fc4e18cdbc53b432dba50e5196ba
    -      0: \x80 PROTO      2
    +obj 0000000000000008 33 sha1:3a63a76c25b677ada2cc1281f0fcbca823c2fde8
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'b1.1'
          30: q    BINPUT     2
          32: .    STOP
    @@ -217,13 +210,13 @@ txn 0285cbad0b851f19 " "
     user "user1.2"
     description "step 1.2"
     extension ""
    -obj 0000000000000003 33 sha1:28e9880fc0f50a9fea5c4a9e861adc1fe44c9f5c
    -      0: \x80 PROTO      2
    +obj 0000000000000003 33 sha1:c13b686e24c0b49869156feaafa5299a0be0db54
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'g1.2'
          30: q    BINPUT     2
          32: .    STOP
    @@ -234,13 +227,13 @@ txn 0285cbad10369d66 " "
     user "user1.3"
     description "step 1.3"
     extension ""
    -obj 0000000000000003 33 sha1:5fb466e36ea6f847b73ad7976def8ad60e00e766
    -      0: \x80 PROTO      2
    +obj 0000000000000003 33 sha1:edbfe9c47fdfd3eeb89578d2b975196b72e04a47
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'g1.3'
          30: q    BINPUT     2
          32: .    STOP
    @@ -251,13 +244,13 @@ txn 0285cbad14e81bb3 " "
     user "user1.4"
     description "step 1.4"
     extension ""
    -obj 0000000000000007 33 sha1:90b0ffa657df9de708913a2cbbd454126fd9de15
    -      0: \x80 PROTO      2
    +obj 0000000000000007 33 sha1:0ce3b56cc68602d8fcf9633527fc02d68d3c7963
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'c1.4'
          30: q    BINPUT     2
          32: .    STOP
    @@ -268,13 +261,13 @@ txn 0285cbad19999a00 " "
     user "user1.5"
     description "step 1.5"
     extension ""
    -obj 0000000000000001 33 sha1:70b0a88b7652b82b82539800484dc7788277f32a
    -      0: \x80 PROTO      2
    +obj 0000000000000001 33 sha1:9bb04c55d1990c274fcc9f6d71701456c999154d
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'f1.5'
          30: q    BINPUT     2
          32: .    STOP
    @@ -285,13 +278,13 @@ txn 0285cbad1e4b184c " "
     user "user1.6"
     description "step 1.6"
     extension ""
    -obj 0000000000000002 33 sha1:e9018b0bc67c9de08becf1f1fe1a548ed263fb29
    -      0: \x80 PROTO      2
    +obj 0000000000000002 33 sha1:3856df32ef7c512e9fd2599772e431ce3a18b5f5
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'd1.6'
          30: q    BINPUT     2
          32: .    STOP
    @@ -302,13 +295,13 @@ txn 0285cbad22fc9699 " "
     user "user1.7"
     description "step 1.7"
     extension ""
    -obj 0000000000000007 33 sha1:0cd3f4b725517a5371429e2ef2f56ea54fe405fb
    -      0: \x80 PROTO      2
    +obj 0000000000000007 33 sha1:3d9da3b8f59a10f15e7c6796023153089d58d969
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'c1.7'
          30: q    BINPUT     2
          32: .    STOP
    @@ -319,13 +312,13 @@ txn 0285cbad27ae14e6 " "
     user "user1.8"
     description "step 1.8"
     extension ""
    -obj 0000000000000007 33 sha1:13e366fb1d15d36a62099e6b835638407718229f
    -      0: \x80 PROTO      2
    +obj 0000000000000007 33 sha1:42c7e6fe473e6d99867b134c44c2d97813629b29
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'c1.8'
          30: q    BINPUT     2
          32: .    STOP
    @@ -336,13 +329,13 @@ txn 0285cbad2c5f9333 " "
     user "user1.9"
     description "step 1.9"
     extension ""
    -obj 0000000000000006 33 sha1:3ac37991a56061c7407cc093ee2a71eef4379131
    -      0: \x80 PROTO      2
    +obj 0000000000000006 33 sha1:88921e4828cbbf11dc61ca6fbaf6595a88fe5076
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'e1.9'
          30: q    BINPUT     2
          32: .    STOP
    @@ -353,13 +346,13 @@ txn 0285cbad31111180 " "
     user "user1.10"
     description "step 1.10"
     extension ""
    -obj 0000000000000005 34 sha1:407cc5710a22f6c387df45aab613aa3673b221c6
    -      0: \x80 PROTO      2
    +obj 0000000000000005 34 sha1:70fe501d55fc4052b73f5e3473262a48555f375f
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'a1.10'
          31: q    BINPUT     2
          33: .    STOP
    @@ -370,13 +363,13 @@ txn 0285cbad35c28fcc " "
     user "user1.11"
     description "step 1.11"
     extension ""
    -obj 0000000000000007 34 sha1:88ab1add11652101077535c03b04e83fe4ddb88b
    -      0: \x80 PROTO      2
    +obj 0000000000000007 34 sha1:f1550b205f2cec40b8716673663fb6e446568772
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'c1.11'
          31: q    BINPUT     2
          33: .    STOP
    @@ -387,13 +380,13 @@ txn 0285cbad3a740e19 " "
     user "user1.12"
     description "step 1.12"
     extension ""
    -obj 0000000000000006 34 sha1:4808aef147f8ded08ffaae2ce04265506385e7f7
    -      0: \x80 PROTO      2
    +obj 0000000000000006 34 sha1:e4587785ac67a316d288d89a2ecf5f7548804416
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'e1.12'
          31: q    BINPUT     2
          33: .    STOP
    @@ -404,13 +397,13 @@ txn 0285cbad3f258c66 " "
     user "user1.13"
     description "step 1.13"
     extension ""
    -obj 0000000000000003 34 sha1:a9f47880096587b359fa7ea6a0fd213e800a24a4
    -      0: \x80 PROTO      2
    +obj 0000000000000003 34 sha1:c40d417ad5140d3c0a76b8119e1bc3f77924851f
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'g1.13'
          31: q    BINPUT     2
          33: .    STOP
    @@ -421,13 +414,13 @@ txn 0285cbad43d70ab3 " "
     user "user1.14"
     description "step 1.14"
     extension ""
    -obj 0000000000000003 34 sha1:e5b3820378e102a61be2b5998ded3182c106c7db
    -      0: \x80 PROTO      2
    +obj 0000000000000003 34 sha1:141ee9a480f2e04c1c2b9fab6cab263010ab32cd
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'g1.14'
          31: q    BINPUT     2
          33: .    STOP
    @@ -438,13 +431,13 @@ txn 0285cbad48888900 " "
     user "user1.15"
     description "step 1.15"
     extension ""
    -obj 0000000000000002 34 sha1:f136bac1befa0fbd1ebd50218f8d9afe00b9b0a5
    -      0: \x80 PROTO      2
    +obj 0000000000000002 34 sha1:ffd9e2447b4d6230d8e4c6584967ebd45bdb69cd
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'd1.15'
          31: q    BINPUT     2
          33: .    STOP
    @@ -455,13 +448,13 @@ txn 0285cbad4d3a074c " "
     user "user1.16"
     description "step 1.16"
     extension ""
    -obj 0000000000000003 34 sha1:778621ce5c5e97b65343b1ab0cc1a3ce5702fbc8
    -      0: \x80 PROTO      2
    +obj 0000000000000003 34 sha1:e320d84b1e6f9b5507665684c57938c97fb8707a
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'g1.16'
          31: q    BINPUT     2
          33: .    STOP
    @@ -472,13 +465,13 @@ txn 0285cbad51eb8599 " "
     user "user1.17"
     description "step 1.17"
     extension ""
    -obj 0000000000000001 34 sha1:eb6d2d192f3d8fe47a1b2e8119d390ed580c3fb4
    -      0: \x80 PROTO      2
    +obj 0000000000000001 34 sha1:a64a2fa4d8de13124ad15958bb44e93bb50be691
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'f1.17'
          31: q    BINPUT     2
          33: .    STOP
    @@ -489,13 +482,13 @@ txn 0285cbad569d03e6 " "
     user "user1.18"
     description "step 1.18"
     extension ""
    -obj 0000000000000005 34 sha1:921682b323eb62f109d052bc1dfd4ffe0dbf79db
    -      0: \x80 PROTO      2
    +obj 0000000000000005 34 sha1:1a13c223b1e3c4336157bd9ea48bcebbf2bfeb83
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'a1.18'
          31: q    BINPUT     2
          33: .    STOP
    @@ -506,13 +499,13 @@ txn 0285cbad5b4e8233 " "
     user "user1.19"
     description "step 1.19"
     extension ""
    -obj 0000000000000003 34 sha1:b0b31eb0b48548119153628eb3c6711d959e9f9b
    -      0: \x80 PROTO      2
    +obj 0000000000000003 34 sha1:a0b9f323870e42230530e88c3d0df4d0ff53d169
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'g1.19'
          31: q    BINPUT     2
          33: .    STOP
    @@ -523,13 +516,13 @@ txn 0285cbad60000080 " "
     user "user1.20"
     description "step 1.20"
     extension ""
    -obj 0000000000000003 34 sha1:6bfd3298d0bea74cfa3d1f01bb722e958e3f1520
    -      0: \x80 PROTO      2
    +obj 0000000000000003 34 sha1:9d877b2756905d307e10300aa81428ea05c630d2
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'g1.20'
          31: q    BINPUT     2
          33: .    STOP
    @@ -540,13 +533,13 @@ txn 0285cbad64b17ecc " "
     user "user1.21"
     description "step 1.21"
     extension ""
    -obj 0000000000000006 34 sha1:0d4b4837500e84b190ea2f92b16ab8ec0c486db5
    -      0: \x80 PROTO      2
    +obj 0000000000000006 34 sha1:4087f3ba62712e5c29b0d861d65bcc9904f0828e
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'e1.21'
          31: q    BINPUT     2
          33: .    STOP
    @@ -557,13 +550,13 @@ txn 0285cbad6962fd19 " "
     user "user1.22"
     description "step 1.22"
     extension ""
    -obj 0000000000000005 34 sha1:eacbd02d0d78eece9d784da7f3fd0b2738ca6ce0
    -      0: \x80 PROTO      2
    +obj 0000000000000005 34 sha1:7f234b2ebf6c51bbc2acf55bc481b8ca0912b088
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'a1.22'
          31: q    BINPUT     2
          33: .    STOP
    @@ -574,13 +567,13 @@ txn 0285cbad6e147b66 " "
     user "user1.23"
     description "step 1.23"
     extension ""
    -obj 0000000000000005 34 sha1:1b443228d5a434ddd9616ecb5aa90672c0ce9ba2
    -      0: \x80 PROTO      2
    +obj 0000000000000005 34 sha1:b54c8d6f9415eef59c5e4598d4ea459c7def7ae5
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'a1.23'
          31: q    BINPUT     2
          33: .    STOP
    @@ -591,13 +584,13 @@ txn 0285cbad72c5f9b3 " "
     user "user1.24"
     description "step 1.24"
     extension ""
    -obj 0000000000000001 34 sha1:b35a1826cc6cb71b9ddff043f0e8f88b4d90281f
    -      0: \x80 PROTO      2
    +obj 0000000000000001 34 sha1:fc513f6a915be326a3d1212b12b389f284a329b2
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'f1.24'
          31: q    BINPUT     2
          33: .    STOP
    @@ -620,33 +613,32 @@ txn 0285cbad80da7499 " "
     user "user"
     description "cyclic reference"
     extension ""
    -obj 0000000000000006 41 sha1:863d327e4b795efff7dff75bb73c0d20ea3981aa
    -      0: \x80 PROTO      2
    +obj 0000000000000006 39 sha1:baf12eac4d077427f66ff902f64d44a2a141bfd6
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x06'
    -     34: q    BINPUT     2
    -     36: h    BINGET     1
    -     38: \x86 TUPLE2
    -     39: Q    BINPERSID
    -     40: .    STOP
    -  highest protocol among opcodes = 2
    +     22: \x80 PROTO      3
    +     24: C    SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x06'
    +     34: h    BINGET     1
    +     36: \x86 TUPLE2
    +     37: Q    BINPERSID
    +     38: .    STOP
    +  highest protocol among opcodes = 3

     txn 0285cbad858bf2e6 " "
     user ""
     description "predelete 6"
     extension ""
    -obj 0000000000000000 213 sha1:7247042925f5c18f3695d860eeb2759b78109a55
    -      0: \x80 PROTO      2
    +obj 0000000000000000 199 sha1:eaa0f1b643468f33c6b87a875d67eb3b349be5dd
    +      0: \x80 PROTO      3
           2: c    GLOBAL     'persistent.mapping PersistentMapping'
          40: q    BINPUT     1
          42: .    STOP
       highest protocol among opcodes = 2
    -     43: \x80 PROTO      2
    +     43: \x80 PROTO      3
          45: }    EMPTY_DICT
          46: q    BINPUT     2
          48: U    SHORT_BINSTRING 'data'
    @@ -655,60 +647,53 @@ obj 0000000000000000 213 sha1:7247042925f5c18f3695d860eeb2759b78109a55
          57: q    BINPUT     4
          59: (    MARK
          60: U        SHORT_BINSTRING 'a'
    -     63: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x05'
    -     73: q        BINPUT     5
    -     75: c        GLOBAL     '__main__ Object'
    -     92: q        BINPUT     6
    -     94: \x86     TUPLE2
    -     95: Q        BINPERSID
    -     96: U        SHORT_BINSTRING 'c'
    -     99: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x07'
    -    109: q        BINPUT     7
    -    111: h        BINGET     6
    -    113: \x86     TUPLE2
    -    114: Q        BINPERSID
    -    115: U        SHORT_BINSTRING 'b'
    -    118: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x08'
    -    128: q        BINPUT     8
    -    130: h        BINGET     6
    -    132: \x86     TUPLE2
    -    133: Q        BINPERSID
    -    134: U        SHORT_BINSTRING 'e'
    -    137: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\t'
    -    147: q        BINPUT     9
    -    149: h        BINGET     6
    -    151: \x86     TUPLE2
    -    152: Q        BINPERSID
    -    153: U        SHORT_BINSTRING 'd'
    -    156: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x02'
    -    166: q        BINPUT     10
    -    168: h        BINGET     6
    -    170: \x86     TUPLE2
    -    171: Q        BINPERSID
    -    172: U        SHORT_BINSTRING 'g'
    -    175: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x03'
    -    185: q        BINPUT     11
    -    187: h        BINGET     6
    -    189: \x86     TUPLE2
    -    190: Q        BINPERSID
    -    191: U        SHORT_BINSTRING 'f'
    -    194: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x01'
    -    204: q        BINPUT     12
    -    206: h        BINGET     6
    -    208: \x86     TUPLE2
    -    209: Q        BINPERSID
    -    210: u        SETITEMS   (MARK at 59)
    -    211: s    SETITEM
    -    212: .    STOP
    -  highest protocol among opcodes = 2
    -
    -obj 0000000000000009 32 sha1:1a43b55bc4a19245cce9eb5aa5ad411006f06afe
    -      0: \x80 PROTO      2
    +     63: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x05'
    +     73: c        GLOBAL     '__main__ Object'
    +     90: q        BINPUT     5
    +     92: \x86     TUPLE2
    +     93: Q        BINPERSID
    +     94: U        SHORT_BINSTRING 'c'
    +     97: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x07'
    +    107: h        BINGET     5
    +    109: \x86     TUPLE2
    +    110: Q        BINPERSID
    +    111: U        SHORT_BINSTRING 'b'
    +    114: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x08'
    +    124: h        BINGET     5
    +    126: \x86     TUPLE2
    +    127: Q        BINPERSID
    +    128: U        SHORT_BINSTRING 'e'
    +    131: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\t'
    +    141: h        BINGET     5
    +    143: \x86     TUPLE2
    +    144: Q        BINPERSID
    +    145: U        SHORT_BINSTRING 'd'
    +    148: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x02'
    +    158: h        BINGET     5
    +    160: \x86     TUPLE2
    +    161: Q        BINPERSID
    +    162: U        SHORT_BINSTRING 'g'
    +    165: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x03'
    +    175: h        BINGET     5
    +    177: \x86     TUPLE2
    +    178: Q        BINPERSID
    +    179: U        SHORT_BINSTRING 'f'
    +    182: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x01'
    +    192: h        BINGET     5
    +    194: \x86     TUPLE2
    +    195: Q        BINPERSID
    +    196: u        SETITEMS   (MARK at 59)
    +    197: s    SETITEM
    +    198: .    STOP
    +  highest protocol among opcodes = 3
    +
    +obj 0000000000000009 32 sha1:c10d44876cbf78e49f7cc633d985206f51ecc278
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'e1*'
          29: q    BINPUT     2
          31: .    STOP
    @@ -725,13 +710,13 @@ txn 0285cbadc740db19 " "
     user "user2.0"
     description "step 2.0"
     extension ""
    -obj 0000000000000001 33 sha1:7b5599bdbf192e2d33e2597b52c8a72a751ddd13
    -      0: \x80 PROTO      2
    +obj 0000000000000001 33 sha1:118c46c51bb0f08ce76d8f4f3b5d923b81abdd46
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'f2.0'
          30: q    BINPUT     2
          32: .    STOP
    @@ -742,13 +727,13 @@ txn 0285cbadcbf25966 " "
     user "user2.1"
     description "step 2.1"
     extension ""
    -obj 0000000000000002 33 sha1:50b0cf792f2fdc3fbfc5f47f148784924350e31c
    -      0: \x80 PROTO      2
    +obj 0000000000000002 33 sha1:89ff5e4440585130863b518c044d35e0154daecc
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'd2.1'
          30: q    BINPUT     2
          32: .    STOP
    @@ -759,13 +744,13 @@ txn 0285cbadd0a3d7b3 " "
     user "user2.2"
     description "step 2.2"
     extension ""
    -obj 0000000000000003 33 sha1:71f1255a9751e0f223f079552e182cf26b27c0a6
    -      0: \x80 PROTO      2
    +obj 0000000000000003 33 sha1:e0470e3dee47625819f9bfe8085c1bce2a7a4a42
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'g2.2'
          30: q    BINPUT     2
          32: .    STOP
    @@ -776,13 +761,13 @@ txn 0285cbadd5555600 " "
     user "user2.3"
     description "step 2.3"
     extension ""
    -obj 0000000000000003 33 sha1:e6236b8f0a4a2201c0c2375a8f360905108eff2d
    -      0: \x80 PROTO      2
    +obj 0000000000000003 33 sha1:b1a3740b05c6cae5f6c851b715c76dd7348228a9
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'g2.3'
          30: q    BINPUT     2
          32: .    STOP
    @@ -793,13 +778,13 @@ txn 0285cbadda06d44c " "
     user "user2.4"
     description "step 2.4"
     extension ""
    -obj 0000000000000009 33 sha1:55a37439e3dc66552d680833af332b8be83bfc2a
    -      0: \x80 PROTO      2
    +obj 0000000000000009 33 sha1:d0368e87213747ab68d8e4f7a87ff1ea959ea579
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'e2.4'
          30: q    BINPUT     2
          32: .    STOP
    @@ -810,13 +795,13 @@ txn 0285cbaddeb85299 " "
     user "user2.5"
     description "step 2.5"
     extension ""
    -obj 0000000000000005 33 sha1:6beb5d1ca083744ff1e8a13c0bee70c2df54a05c
    -      0: \x80 PROTO      2
    +obj 0000000000000005 33 sha1:e5af7f0b8e157926739f657e729594908d188a3d
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'a2.5'
          30: q    BINPUT     2
          32: .    STOP
    @@ -827,13 +812,13 @@ txn 0285cbade369d0e6 " "
     user "user2.6"
     description "step 2.6"
     extension ""
    -obj 0000000000000008 33 sha1:2a3221e27ac8fbf15ab75b38a9a65e727d237355
    -      0: \x80 PROTO      2
    +obj 0000000000000008 33 sha1:dc70c3b1413c79d75bcfdcc50c3e803273f857ef
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'b2.6'
          30: q    BINPUT     2
          32: .    STOP
    @@ -844,13 +829,13 @@ txn 0285cbade81b4f33 " "
     user "user2.7"
     description "step 2.7"
     extension ""
    -obj 0000000000000003 33 sha1:408fddc8c7255c5e2ed94c239ac57c211ab94b6d
    -      0: \x80 PROTO      2
    +obj 0000000000000003 33 sha1:35892bc2c71edb022b029aa1e4bf8201ccab4b0c
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'g2.7'
          30: q    BINPUT     2
          32: .    STOP
    @@ -861,13 +846,13 @@ txn 0285cbadeccccd80 " "
     user "user2.8"
     description "step 2.8"
     extension ""
    -obj 0000000000000002 33 sha1:72eda0cdae0addbec9472e28b5a9a91ecdf41bbf
    -      0: \x80 PROTO      2
    +obj 0000000000000002 33 sha1:b2da174266d0f0e0b58c214e6d79851f4a18b554
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'd2.8'
          30: q    BINPUT     2
          32: .    STOP
    @@ -878,13 +863,13 @@ txn 0285cbadf17e4bcc " "
     user "user2.9"
     description "step 2.9"
     extension ""
    -obj 0000000000000009 33 sha1:f1d87ba386f57291ecc925020a05df06caedb278
    -      0: \x80 PROTO      2
    +obj 0000000000000009 33 sha1:92cf61eb5855d3b25fecbe7a458f1b21946f5ba3
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'e2.9'
          30: q    BINPUT     2
          32: .    STOP
    @@ -895,13 +880,13 @@ txn 0285cbadf62fca19 " "
     user "user2.10"
     description "step 2.10"
     extension ""
    -obj 0000000000000007 34 sha1:6696fa0434fadb645687c74c8561f0f55fce1fd6
    -      0: \x80 PROTO      2
    +obj 0000000000000007 34 sha1:f737655162c594cf8296b38f7c435a5e8e06d6d7
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'c2.10'
          31: q    BINPUT     2
          33: .    STOP
    @@ -912,13 +897,13 @@ txn 0285cbadfae14866 " "
     user "user2.11"
     description "step 2.11"
     extension ""
    -obj 0000000000000002 34 sha1:14e8b27b3bc8bf5b4d86ca162cc1c912a29a1c05
    -      0: \x80 PROTO      2
    +obj 0000000000000002 34 sha1:032d8305ea9de2ec785fc77c1743a37bb64553cd
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'd2.11'
          31: q    BINPUT     2
          33: .    STOP
    @@ -929,13 +914,13 @@ txn 0285cbadff92c6b3 " "
     user "user2.12"
     description "step 2.12"
     extension ""
    -obj 0000000000000003 34 sha1:db269b90a0df33aa7d411c672f93fb7d86bbdb87
    -      0: \x80 PROTO      2
    +obj 0000000000000003 34 sha1:975fd7ef6350b6543495a800852969f1d7833c83
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'g2.12'
          31: q    BINPUT     2
          33: .    STOP
    @@ -946,13 +931,13 @@ txn 0285cbae04444500 " "
     user "user2.13"
     description "step 2.13"
     extension ""
    -obj 0000000000000002 34 sha1:4b28f9e97ff4f61f3dfba30b9f7aceb4913215ce
    -      0: \x80 PROTO      2
    +obj 0000000000000002 34 sha1:d09e49d753b8183ba5e0fa042a239f103d54c873
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'd2.13'
          31: q    BINPUT     2
          33: .    STOP
    @@ -963,13 +948,13 @@ txn 0285cbae08f5c34c " "
     user "user2.14"
     description "step 2.14"
     extension ""
    -obj 0000000000000007 34 sha1:c3eabecf360015b4b7555abc3a0dc0cea77fe7ed
    -      0: \x80 PROTO      2
    +obj 0000000000000007 34 sha1:109581582c53bf400e56780c331410e5195d19e0
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'c2.14'
          31: q    BINPUT     2
          33: .    STOP
    @@ -980,13 +965,13 @@ txn 0285cbae0da74199 " "
     user "user2.15"
     description "step 2.15"
     extension ""
    -obj 0000000000000009 34 sha1:25ffaeb6090581d72bce075a765d3cf4198af90f
    -      0: \x80 PROTO      2
    +obj 0000000000000009 34 sha1:e67485cd99587ee9e98158db69ed668fb233093d
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'e2.15'
          31: q    BINPUT     2
          33: .    STOP
    @@ -997,13 +982,13 @@ txn 0285cbae1258bfe6 " "
     user "user2.16"
     description "step 2.16"
     extension ""
    -obj 0000000000000001 34 sha1:e934438dede49d14ee2d1d2afa8fa18774547764
    -      0: \x80 PROTO      2
    +obj 0000000000000001 34 sha1:b9f373fb2097836edf1c9ffbf0ca55d1d2b2168f
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'f2.16'
          31: q    BINPUT     2
          33: .    STOP
    @@ -1014,13 +999,13 @@ txn 0285cbae170a3e33 " "
     user "user2.17"
     description "step 2.17"
     extension ""
    -obj 0000000000000008 34 sha1:9961f82b3f01204f80efbb3b62a2b98d9d3202fa
    -      0: \x80 PROTO      2
    +obj 0000000000000008 34 sha1:698e7a066839a9436339747fe7a85f475095af67
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'b2.17'
          31: q    BINPUT     2
          33: .    STOP
    @@ -1031,13 +1016,13 @@ txn 0285cbae1bbbbc80 " "
     user "user2.18"
     description "step 2.18"
     extension ""
    -obj 0000000000000002 34 sha1:5294513e1e00c7de532f4f90068b2147bf87f673
    -      0: \x80 PROTO      2
    +obj 0000000000000002 34 sha1:0d2f350bbfeb38c85466b05b336f9414b9e91f77
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'd2.18'
          31: q    BINPUT     2
          33: .    STOP
    @@ -1048,13 +1033,13 @@ txn 0285cbae206d3acc " "
     user "user2.19"
     description "step 2.19"
     extension ""
    -obj 0000000000000009 34 sha1:523ec17c6d74016e3464d52bb7c7b7baa4b82a20
    -      0: \x80 PROTO      2
    +obj 0000000000000009 34 sha1:471ca065c05720073421a0aeab549cb1e58cf99f
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'e2.19'
          31: q    BINPUT     2
          33: .    STOP
    @@ -1065,13 +1050,13 @@ txn 0285cbae251eb919 " "
     user "user2.20"
     description "step 2.20"
     extension ""
    -obj 0000000000000008 34 sha1:14b17f0e944432782cb270205b2e96948d112619
    -      0: \x80 PROTO      2
    +obj 0000000000000008 34 sha1:3b543565ce78028b7118f322a8d1faf2439d70e4
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'b2.20'
          31: q    BINPUT     2
          33: .    STOP
    @@ -1082,13 +1067,13 @@ txn 0285cbae29d03766 " "
     user "user2.21"
     description "step 2.21"
     extension ""
    -obj 0000000000000009 34 sha1:27744ea516240e0d00be75f26af9698f842bdda5
    -      0: \x80 PROTO      2
    +obj 0000000000000009 34 sha1:79714405c7319c5800c2fe5f192a8a1e8a33d873
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'e2.21'
          31: q    BINPUT     2
          33: .    STOP
    @@ -1099,13 +1084,13 @@ txn 0285cbae2e81b5b3 " "
     user "user2.22"
     description "step 2.22"
     extension ""
    -obj 0000000000000009 34 sha1:a3f303ddd4f2fb9369f6fbbb38ae8030f7f8188d
    -      0: \x80 PROTO      2
    +obj 0000000000000009 34 sha1:fb3f01b3470c5dcf9b4ce613bdd3821f2b9a3576
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'e2.22'
          31: q    BINPUT     2
          33: .    STOP
    @@ -1116,13 +1101,13 @@ txn 0285cbae33333400 " "
     user "user2.23"
     description "step 2.23"
     extension ""
    -obj 0000000000000002 34 sha1:343bed4b31f4fe69a92ee51d28fd7b9cfd6ecb8b
    -      0: \x80 PROTO      2
    +obj 0000000000000002 34 sha1:2a646981c19fe36d62d89df7e1fd344eb648f9b8
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'd2.23'
          31: q    BINPUT     2
          33: .    STOP
    @@ -1133,13 +1118,13 @@ txn 0285cbae37e4b24c " "
     user "user2.24"
     description "step 2.24"
     extension ""
    -obj 0000000000000009 34 sha1:8804c60dc27b2e2f6908e2a099a5c5d4b5abc843
    -      0: \x80 PROTO      2
    +obj 0000000000000009 34 sha1:8b769601aed2ebd9f3cc8fe1e63b2cd8975f9f2d
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'e2.24'
          31: q    BINPUT     2
          33: .    STOP
    @@ -1162,33 +1147,32 @@ txn 0285cbae45f92d33 " "
     user "user"
     description "cyclic reference"
     extension ""
    -obj 0000000000000002 41 sha1:1e2e3ac81badec749c2082a08d205c06c6bb5119
    -      0: \x80 PROTO      2
    +obj 0000000000000002 39 sha1:f44b22761c7e1df86ed61823eb1404e463378a32
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x02'
    -     34: q    BINPUT     2
    -     36: h    BINGET     1
    -     38: \x86 TUPLE2
    -     39: Q    BINPERSID
    -     40: .    STOP
    -  highest protocol among opcodes = 2
    +     22: \x80 PROTO      3
    +     24: C    SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x02'
    +     34: h    BINGET     1
    +     36: \x86 TUPLE2
    +     37: Q    BINPERSID
    +     38: .    STOP
    +  highest protocol among opcodes = 3

     txn 0285cbae4aaaab80 " "
     user ""
     description "predelete 2"
     extension ""
    -obj 0000000000000000 213 sha1:ee7932656b49c1a3f6271c9b58786f85a29179a2
    -      0: \x80 PROTO      2
    +obj 0000000000000000 199 sha1:a51d894c29856c2e8b8194e714cd84a0a23d03b8
    +      0: \x80 PROTO      3
           2: c    GLOBAL     'persistent.mapping PersistentMapping'
          40: q    BINPUT     1
          42: .    STOP
       highest protocol among opcodes = 2
    -     43: \x80 PROTO      2
    +     43: \x80 PROTO      3
          45: }    EMPTY_DICT
          46: q    BINPUT     2
          48: U    SHORT_BINSTRING 'data'
    @@ -1197,60 +1181,53 @@ obj 0000000000000000 213 sha1:ee7932656b49c1a3f6271c9b58786f85a29179a2
          57: q    BINPUT     4
          59: (    MARK
          60: U        SHORT_BINSTRING 'a'
    -     63: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x05'
    -     73: q        BINPUT     5
    -     75: c        GLOBAL     '__main__ Object'
    -     92: q        BINPUT     6
    -     94: \x86     TUPLE2
    -     95: Q        BINPERSID
    -     96: U        SHORT_BINSTRING 'c'
    -     99: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x07'
    -    109: q        BINPUT     7
    -    111: h        BINGET     6
    -    113: \x86     TUPLE2
    -    114: Q        BINPERSID
    -    115: U        SHORT_BINSTRING 'b'
    -    118: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x08'
    -    128: q        BINPUT     8
    -    130: h        BINGET     6
    -    132: \x86     TUPLE2
    -    133: Q        BINPERSID
    -    134: U        SHORT_BINSTRING 'e'
    -    137: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\t'
    -    147: q        BINPUT     9
    -    149: h        BINGET     6
    -    151: \x86     TUPLE2
    -    152: Q        BINPERSID
    -    153: U        SHORT_BINSTRING 'd'
    -    156: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\n'
    -    166: q        BINPUT     10
    -    168: h        BINGET     6
    -    170: \x86     TUPLE2
    -    171: Q        BINPERSID
    -    172: U        SHORT_BINSTRING 'g'
    -    175: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x03'
    -    185: q        BINPUT     11
    -    187: h        BINGET     6
    -    189: \x86     TUPLE2
    -    190: Q        BINPERSID
    -    191: U        SHORT_BINSTRING 'f'
    -    194: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x01'
    -    204: q        BINPUT     12
    -    206: h        BINGET     6
    -    208: \x86     TUPLE2
    -    209: Q        BINPERSID
    -    210: u        SETITEMS   (MARK at 59)
    -    211: s    SETITEM
    -    212: .    STOP
    -  highest protocol among opcodes = 2
    -
    -obj 000000000000000a 32 sha1:c9a667705323348a209f8f3b22c1977dbcd3f7e9
    -      0: \x80 PROTO      2
    +     63: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x05'
    +     73: c        GLOBAL     '__main__ Object'
    +     90: q        BINPUT     5
    +     92: \x86     TUPLE2
    +     93: Q        BINPERSID
    +     94: U        SHORT_BINSTRING 'c'
    +     97: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x07'
    +    107: h        BINGET     5
    +    109: \x86     TUPLE2
    +    110: Q        BINPERSID
    +    111: U        SHORT_BINSTRING 'b'
    +    114: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x08'
    +    124: h        BINGET     5
    +    126: \x86     TUPLE2
    +    127: Q        BINPERSID
    +    128: U        SHORT_BINSTRING 'e'
    +    131: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\t'
    +    141: h        BINGET     5
    +    143: \x86     TUPLE2
    +    144: Q        BINPERSID
    +    145: U        SHORT_BINSTRING 'd'
    +    148: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\n'
    +    158: h        BINGET     5
    +    160: \x86     TUPLE2
    +    161: Q        BINPERSID
    +    162: U        SHORT_BINSTRING 'g'
    +    165: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x03'
    +    175: h        BINGET     5
    +    177: \x86     TUPLE2
    +    178: Q        BINPERSID
    +    179: U        SHORT_BINSTRING 'f'
    +    182: C        SHORT_BINBYTES '\x00\x00\x00\x00\x00\x00\x00\x01'
    +    192: h        BINGET     5
    +    194: \x86     TUPLE2
    +    195: Q        BINPERSID
    +    196: u        SETITEMS   (MARK at 59)
    +    197: s    SETITEM
    +    198: .    STOP
    +  highest protocol among opcodes = 3
    +
    +obj 000000000000000a 32 sha1:25364c8085cd5e554eb4756133186e5cf386032b
    +      0: \x80 PROTO      3
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    +     22: \x80 PROTO      3
          24: U    SHORT_BINSTRING 'd2*'
          29: q    BINPUT     2
          31: .    STOP

09d79332

test/*: Start testing zodbtools behaviour on ZODB databases of multiple kinds · bf772ce0

Kirill Smelkov authored Jul 16, 2024

Since 0b6f99da (test/gen_testdata: Fix for ZODB5 > 5.5.1 + preserve
database compatibility with ZODB3/py2) we are generating our test
database with using pickle protocol=2. This was done in order to make
sure the zodbtools works ok with data generated by e.g. ZODB4. However
we still have lots of databases that are generated with pickle
protocol=1, and we also have newer databases that are generated with
pickle protocol=3. Note that it is not only data records who are
affected by specified pickle protocol. For example for FileStorage the
index is also saved via pickling and so used pickle protocol affects
index format. For example ZODB/go currently cannot load FileStorage
index if it was saved via protocol=3.

Since zodbtools should work ok with any data it creates a need to test
it against all kinds of ZODB databases: generated by either py2 or py3,
and saved via pickle protocol 1,2 and 3.

In this patch we add infrastructure for such testing and extend testdata
coverage to cover not only py2_pickle2, but also py2_pickle1. We will
add support for py2_pickle3 and py3_pickle3 in the follow-up patches.

Testdata files are now located inside dedicated subdirectories - one for
one ZODB kind. py2_pickle2/* is exactly the same compared to testdata
files we had before. py2_pickle1/* is bit different. It is handy to see
the difference via e.g.

$ diff -u py2_pickle2/zdump.zpickledis.ok py2_pickle1/zdump.zpickledis.ok

In tests particular kind of testdata is now accessed via ztestdata
fixture. Please see changes in zodbtools/test/conftest.py and
zodbtools/test/gen_testdata.py for details.

bf772ce0

zodbanalyze: tests: Verify CSV mode via golden output generated during gen_testdata · e66451c0

Kirill Smelkov authored Jul 16, 2024

Instead of putting expected output into test code.

The reason for this change is that soon, with many kinds of generated
ZODB databases, analyze output will be different for each kind, and the
only practical way to make sure that analyze works correctly is to have
good expected output for each kind.

We already do this way for zodbdump. Start doing the same for
zodbanalyze as a preparatory step as well.

e66451c0

test/gen_testdata: Prevent object with OID=1 to be deleted · a2c660a7

Kirill Smelkov authored Jul 16, 2024

Previously it was like this by luck, but recent changes shuffled
generated output and one of delete selection started to point to OID 1:

    (zdev+py39.env) kirr@deca:~/src/wendelin/z/zodbtools/zodbtools/test/testdata$ grep '^obj .* delete' 1.zdump.zpickledis.ok
    obj 0000000000000001 delete
    obj 0000000000000002 delete

However NEO/go tests depend on object with OID=1 to be present:

https://lab.nexedi.com/kirr/neo/-/blob/1ad088c8/go/neo/neo_test.go#L216-219

and it breaks there if here we let that object with OID=1 to be deleted.

-> Prevent ZODB/go breakage by explicitly making sure that OID=1 stays
present under any conditions.

The actual places where gen_testdata.py from zodbtools is used in
ZODB/go and Wendelin.core are e.g. here:

https://lab.nexedi.com/kirr/neo/-/blob/f7776fc1/go/zodb/storage/fs1/py/gen-testdata
https://lab.nexedi.com/nexedi/wendelin.core/-/blob/07087ec8/wcfs/internal/zdata/testdata/zblk_test_gen.py

a2c660a7

test/gen_testdata: Switch to random2 for PRNG · f38e7941

Kirill Smelkov authored Jul 16, 2024

Python3 changed behaviour of random module compared to its previous
behaviour under Python2:

    $ python2
    Python 2.7.18 (default, Jul 14 2021, 08:11:37)
    [GCC 10.2.1 20210110] on linux2
    Type "help", "copyright", "credits" or "license" for more information.
    >>> import random
    >>> random.seed(0)
    >>> for _ in range(5): print(random.randint(0,99))
    ...
    84
    75
    42
    25
    51

    $ python3
    Python 3.11.2 (main, Mar 13 2023, 12:18:29) [GCC 12.2.0] on linux
    Type "help", "copyright", "credits" or "license" for more information.
    >>> import random
    >>> random.seed(0)
    >>> for _ in range(5): print(random.randint(0,99))
    ...
    49
    97
    53
    5
    33

Since gen_testdata.py uses PRNG heavily it means that with PRNG based on
builtin random module of current python, generated output will differ
strongly in between py2 and py3 versions.

However we want generated outputs to be close to each other for py2 and
py3 so that it is easier to analyze what is essential difference in
generated databases.

-> Make sure py2/py3 databases will be logically the same by explicitly
using random2 and asserting that PRNG behaviour is stable independently
of current python.

No change in generated files as behaviour of random2 is by definition
exactly the same as behaviour of builtin random on py2:

https://pypi.org/project/random2/

f38e7941

test/gen_testdata: Retrieve object keys in predictable order independent of python version · 1118ba3a

Kirill Smelkov authored Jul 16, 2024

gen_testdata.py picks up root keys randomly and shuffles extension dict
keys also randomly. But even with predictable PRNG if the input to e.g.
rand.choice is different, the result will be different as well.

So far we were lucky: we were running gen_testdata.py only via py2 and
the order of retrieved root keys was - by chance - the same each time.
That's why generated testdata databases were the same after each
gen_testdata.py run. But even on py2 there is no such guaranty and when
runnning gen_testdata.py via py3 the order of keys is really different:

    $ python2
    Python 2.7.18 (default, Jul 14 2021, 08:11:37)
    [GCC 10.2.1 20210110] on linux2
    Type "help", "copyright", "credits" or "license" for more information.
    >>> d = {}
    >>> d['a'] = 1
    >>> d['b'] = 2
    >>> d['c'] = 3
    >>> d.keys()
    ['a', 'c', 'b']

    $ python3
    Python 3.11.2 (main, Mar 13 2023, 12:18:29) [GCC 12.2.0] on linux
    Type "help", "copyright", "credits" or "license" for more information.
    >>> d = {}
    >>> d['a'] = 1
    >>> d['b'] = 2
    >>> d['c'] = 3
    >>> list(d.keys())
    ['a', 'b', 'c']

So let's prepare for py3 generation beforehand by making sure that
keys input to PRNG is the same be it py2 or py3, thus, giving a chance
for generated py2/py3 databases to be really close to each other.

Since here we change the order of keys that are feed to PRNG, generated
test databases are shuffled a bit.

1118ba3a

test/gen_testdata: Use our own PRNG instance · 667a0088

Kirill Smelkov authored Jul 16, 2024

This protects us from ZODB and other third-party code from using
global PRNG and thus affecting its state and gen_testdata.py output.

Till now we were lucky that there was no such third-party user and so
the output of gen_testdata.py remains exactly the same as before hereby
patch. But better be robust and avoid even potential possibility of such
situations.

Using private PRNG will also help later when running gen_testdata.py via
Python3 : in py3 they changed behaviour of builtin random and emitted
numbers differ from the same random when run under py2. By using our own
PRNG we will be able to level-out that and use essentially the same PRNG
on both py2 and py3.

667a0088

test/gen_testdata: Start generating test files from clean empty state · 55769490

Kirill Smelkov authored Jul 16, 2024

Previsouly we were generating e.g. 1.fs starting over existing 1.fs and
due to that when FileStoraga was opening it, it was e.g. scanning
existing 1.fs.index, thus doing some time() calls and so when the
database was started to be generted the state of the timer was different
compared to the situation if the database did not existed before
gen_testdata.py run. In other words the result of gen_testdata.py run
was different for the cases when it run after `rm testdata/1*` and
without that rm.

-> Make gen_testdata result to be stable irregardless of the start state
when it runs by explicitly removing test databases fitst.

As diff to *.zpickledis.ok shows, resulting changes are only in
transaction IDs.

55769490

16 Jul, 2024 1 commit

test/gen_testdata: Make sure that "with zext" and "without zext" databases... · 395d8c27

Kirill Smelkov authored Jul 16, 2024

test/gen_testdata: Make sure that "with zext" and "without zext" databases differ only in transaction extension

Previously diff in between 1.zdump.zpickledis.ok and 1_!zext.zdump.zpickledis.ok
indicated difference in many data records as demonstrated in the appendix.
That was due to that !zext variant, while skipping generating
transaction extension, contrary to zext variant, did not consumed PRNG
output, and so when going further PRNG state for zext and !zext variants
was diverging.

-> Fix it via consuming PRNG output in !zext case exactly the same way
as in zext case, but throwing out ext4subj output.

After the patch the diff in between `1.zdump.zpickledis.ok
1_\!zext.zdump.zpickledis.ok` shows only differences in between
txn.extension fields:

    --- a/1.zdump.zpickledis.ok
    +++ b/1_!zext.zdump.zpickledis.ok
    @@ -1,19 +1,7 @@
     txn 0285cbac75555580 "p"
     user "user0.12"
     description "step 0.12"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookie8'
    -     17: U        SHORT_BINSTRING '2MHMU'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (f)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    +extension ""
     obj 0000000000000001 34 sha1:9fae782fe3e33273b520c954925704856ca90dc6
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
     ...

Appendix. `1.zdump.zpickledis.ok 1_\!zext.zdump.zpickledis.ok` before this patch

    diff --git a/1.zdump.zpickledis.ok b/1_!zext.zdump.zpickledis.ok
    index 9385444..f80531d 100644
    --- a/1.zdump.zpickledis.ok
    +++ b/1_!zext.zdump.zpickledis.ok
    @@ -1,114 +1,49 @@
    -txn 0285cbac75555580 "p"
    -user "user0.12"
    -description "step 0.12"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookie8'
    -     17: U        SHORT_BINSTRING '2MHMU'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (f)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000001 34 sha1:9fae782fe3e33273b520c954925704856ca90dc6
    -      0: \x80 PROTO      2
    -      2: c    GLOBAL     '__main__ Object'
    -     19: q    BINPUT     1
    -     21: .    STOP
    -  highest protocol among opcodes = 2
    -     22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'f0.12'
    -     31: q    BINPUT     2
    -     33: .    STOP
    -  highest protocol among opcodes = 2
    -
    -
     txn 0285cbac8369d066 "p"
     user "user0.15"
     description "step 0.15"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieY'
    -     17: U        SHORT_BINSTRING 'EDZ10'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (e)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000006 34 sha1:5dbf26359289e5a25f9755f832ea91cc8ee76686
    +extension ""
    +obj 0000000000000003 34 sha1:e616d80f35ea7aaaecdbc65e1e5838c25f4bf07a
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'e0.15'
    +     24: U    SHORT_BINSTRING 'b0.15'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2

    -txn 0285cbac962fc999 "p"
    -user "user0.19"
    -description "step 0.19"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieF'
    -     17: U        SHORT_BINSTRING 'OUC9L'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (a)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000005 34 sha1:9e0a8797eb8f60498563703b1961126fba35be9b
    +txn 0285cbac9f92c633 "p"
    +user "user0.21"
    +description "step 0.21"
    +extension ""
    +obj 0000000000000001 34 sha1:025d34759b434419251b5a429f3ad78ce3c2fd98
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'a0.19'
    +     24: U    SHORT_BINSTRING 'f0.21'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2

    -txn 0285cbac9f92c633 "p"
    -user "user0.21"
    -description "step 0.21"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookie8'
    -     17: U        SHORT_BINSTRING '0QC1A'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (d)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000002 34 sha1:009174c1f01142f24495fa13738749ff528fd82c
    +txn 0285cbaca4444480 "p"
    +user "user0.22"
    +description "step 0.22"
    +extension ""
    +obj 0000000000000006 34 sha1:0734767857e69ab8bfd0007d4ca3f1a7fd69b677
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'd0.21'
    +     24: U    SHORT_BINSTRING 'g0.22'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2
    @@ -117,27 +52,15 @@ obj 0000000000000002 34 sha1:009174c1f01142f24495fa13738749ff528fd82c
     txn 0285cbacb70a3db3 "p"
     user "root0.1\nYour\nMagesty "
     description "undo 0.1\nmore detailed description\n\nzzz ...\t"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieV'
    -     17: U        SHORT_BINSTRING 'VHBGT'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (undo AoXLrK2nQRk=)'
    -     69: u        SETITEMS   (MARK at 5)
    -     70: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000003 34 sha1:484358413b2746e8a05b1e3173051abedd28e1fa
    +extension ""
    +obj 0000000000000004 34 sha1:fe21381adc01e51965c3278c6debf52ebd63068c
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'g0.11'
    +     24: U    SHORT_BINSTRING 'd0.11'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2
    @@ -146,27 +69,15 @@ obj 0000000000000003 34 sha1:484358413b2746e8a05b1e3173051abedd28e1fa
     txn 0285cbacbbbbbc00 "p"
     user "user"
     description "cyclic reference"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieE'
    -     17: U        SHORT_BINSTRING 'ZM3QZ'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (cycle)'
    -     57: u        SETITEMS   (MARK at 5)
    -     58: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000007 41 sha1:7108c96ccb9cbeaab1164d533174c300e51309f9
    +extension ""
    +obj 0000000000000002 41 sha1:1e2e3ac81badec749c2082a08d205c06c6bb5119
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x07'
    +     24: U    SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x02'
          34: q    BINPUT     2
          36: h    BINGET     1
          38: \x86 TUPLE2
    @@ -177,9 +88,9 @@ obj 0000000000000007 41 sha1:7108c96ccb9cbeaab1164d533174c300e51309f9

     txn 0285cbacc06d3a4c "p"
     user ""
    -description "predelete 4"
    +description "predelete 5"
     extension ""
    -obj 0000000000000000 213 sha1:a6e70638fafd4619841032356ae93a4da7b539c5
    +obj 0000000000000000 194 sha1:4a9e413a4ff168a6a7f84be32b9168364048fd6d
           0: \x80 PROTO      2
           2: c    GLOBAL     'persistent.mapping PersistentMapping'
          40: q    BINPUT     1
    @@ -193,62 +104,56 @@ obj 0000000000000000 213 sha1:a6e70638fafd4619841032356ae93a4da7b539c5
          56: }    EMPTY_DICT
          57: q    BINPUT     4
          59: (    MARK
    -     60: U        SHORT_BINSTRING 'a'
    -     63: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x05'
    +     60: U        SHORT_BINSTRING 'c'
    +     63: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x02'
          73: q        BINPUT     5
          75: c        GLOBAL     '__main__ Object'
          92: q        BINPUT     6
          94: \x86     TUPLE2
          95: Q        BINPERSID
    -     96: U        SHORT_BINSTRING 'c'
    -     99: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x07'
    +     96: U        SHORT_BINSTRING 'b'
    +     99: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x03'
         109: q        BINPUT     7
         111: h        BINGET     6
         113: \x86     TUPLE2
         114: Q        BINPERSID
    -    115: U        SHORT_BINSTRING 'b'
    -    118: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x08'
    +    115: U        SHORT_BINSTRING 'e'
    +    118: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x07'
         128: q        BINPUT     8
         130: h        BINGET     6
         132: \x86     TUPLE2
         133: Q        BINPERSID
    -    134: U        SHORT_BINSTRING 'e'
    -    137: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x06'
    +    134: U        SHORT_BINSTRING 'd'
    +    137: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x04'
         147: q        BINPUT     9
         149: h        BINGET     6
         151: \x86     TUPLE2
         152: Q        BINPERSID
    -    153: U        SHORT_BINSTRING 'd'
    -    156: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x02'
    +    153: U        SHORT_BINSTRING 'g'
    +    156: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x06'
         166: q        BINPUT     10
         168: h        BINGET     6
         170: \x86     TUPLE2
         171: Q        BINPERSID
    -    172: U        SHORT_BINSTRING 'g'
    -    175: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x03'
    +    172: U        SHORT_BINSTRING 'f'
    +    175: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x01'
         185: q        BINPUT     11
         187: h        BINGET     6
         189: \x86     TUPLE2
         190: Q        BINPERSID
    -    191: U        SHORT_BINSTRING 'f'
    -    194: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x01'
    -    204: q        BINPUT     12
    -    206: h        BINGET     6
    -    208: \x86     TUPLE2
    -    209: Q        BINPERSID
    -    210: u        SETITEMS   (MARK at 59)
    -    211: s    SETITEM
    -    212: .    STOP
    +    191: u        SETITEMS   (MARK at 59)
    +    192: s    SETITEM
    +    193: .    STOP
       highest protocol among opcodes = 2

    -obj 0000000000000008 32 sha1:936674657cf846998d27356363832827fa612092
    +obj 0000000000000007 32 sha1:b9d61167d2388ac320b1bc2940b43e7a8bad46ac
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'b0*'
    +     24: U    SHORT_BINSTRING 'e0*'
          29: q    BINPUT     2
          31: .    STOP
       highest protocol among opcodes = 2
    @@ -257,20 +162,8 @@ obj 0000000000000008 32 sha1:936674657cf846998d27356363832827fa612092
     txn 0285cbad06d3a0cc " "
     user "user1.0"
     description "step 1.0"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieE'
    -     17: U        SHORT_BINSTRING 'VAZ3U'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (e)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000006 33 sha1:f18e991b87b63cf1f9486d74d70020ff8d573eec
    +extension ""
    +obj 0000000000000007 33 sha1:f18e991b87b63cf1f9486d74d70020ff8d573eec
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
    @@ -286,27 +179,15 @@ obj 0000000000000006 33 sha1:f18e991b87b63cf1f9486d74d70020ff8d573eec
     txn 0285cbad0b851f19 " "
     user "user1.1"
     description "step 1.1"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieN'
    -     17: U        SHORT_BINSTRING 'GSV4I'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (b)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000008 33 sha1:c37e1d2350c8fc4e18cdbc53b432dba50e5196ba
    +extension ""
    +obj 0000000000000006 33 sha1:bf4f1be3d63bca5c7dccf98f7660f419597a0f3d
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'b1.1'
    +     24: U    SHORT_BINSTRING 'g1.1'
          30: q    BINPUT     2
          32: .    STOP
       highest protocol among opcodes = 2
    @@ -315,20 +196,8 @@ obj 0000000000000008 33 sha1:c37e1d2350c8fc4e18cdbc53b432dba50e5196ba
     txn 0285cbad10369d66 " "
     user "user1.2"
     description "step 1.2"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieY'
    -     17: U        SHORT_BINSTRING 'A01OK'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (g)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000003 33 sha1:28e9880fc0f50a9fea5c4a9e861adc1fe44c9f5c
    +extension ""
    +obj 0000000000000006 33 sha1:28e9880fc0f50a9fea5c4a9e861adc1fe44c9f5c
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
    @@ -344,27 +213,15 @@ obj 0000000000000003 33 sha1:28e9880fc0f50a9fea5c4a9e861adc1fe44c9f5c
     txn 0285cbad14e81bb3 " "
     user "user1.3"
     description "step 1.3"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-generator'
    -     19: q        BINPUT     2
    -     21: U        SHORT_BINSTRING 'zodb/py2 (g)'
    -     35: U        SHORT_BINSTRING 'x-cookieW'
    -     46: U        SHORT_BINSTRING '1QPNP'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000003 33 sha1:5fb466e36ea6f847b73ad7976def8ad60e00e766
    +extension ""
    +obj 0000000000000004 33 sha1:e8796affc44d563a09a2913907f91467a34498fc
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'g1.3'
    +     24: U    SHORT_BINSTRING 'd1.3'
          30: q    BINPUT     2
          32: .    STOP
       highest protocol among opcodes = 2
    @@ -373,27 +230,15 @@ obj 0000000000000003 33 sha1:5fb466e36ea6f847b73ad7976def8ad60e00e766
     txn 0285cbad19999a00 " "
     user "user1.4"
     description "step 1.4"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieC'
    -     17: U        SHORT_BINSTRING 'J7L05'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (c)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000007 33 sha1:90b0ffa657df9de708913a2cbbd454126fd9de15
    +extension ""
    +obj 0000000000000006 33 sha1:15a38343610d25057cd88521669671350eb0c0a8
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'c1.4'
    +     24: U    SHORT_BINSTRING 'g1.4'
          30: q    BINPUT     2
          32: .    STOP
       highest protocol among opcodes = 2
    @@ -402,27 +247,15 @@ obj 0000000000000007 33 sha1:90b0ffa657df9de708913a2cbbd454126fd9de15
     txn 0285cbad1e4b184c " "
     user "user1.5"
     description "step 1.5"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieA'
    -     17: U        SHORT_BINSTRING 'CM15Z'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (f)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000001 33 sha1:70b0a88b7652b82b82539800484dc7788277f32a
    +extension ""
    +obj 0000000000000003 33 sha1:0adf3b787e6814b6cc073bd51a42c3f18615a674
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'f1.5'
    +     24: U    SHORT_BINSTRING 'b1.5'
          30: q    BINPUT     2
          32: .    STOP
       highest protocol among opcodes = 2
    @@ -431,27 +264,15 @@ obj 0000000000000001 33 sha1:70b0a88b7652b82b82539800484dc7788277f32a
     txn 0285cbad22fc9699 " "
     user "user1.6"
     description "step 1.6"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieI'
    -     17: U        SHORT_BINSTRING 'AH816'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (d)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000002 33 sha1:e9018b0bc67c9de08becf1f1fe1a548ed263fb29
    +extension ""
    +obj 0000000000000001 33 sha1:4d811fcaaa707127f5f6f49dc368ffd2ebae1018
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'd1.6'
    +     24: U    SHORT_BINSTRING 'f1.6'
          30: q    BINPUT     2
          32: .    STOP
       highest protocol among opcodes = 2
    @@ -460,27 +281,15 @@ obj 0000000000000002 33 sha1:e9018b0bc67c9de08becf1f1fe1a548ed263fb29
     txn 0285cbad27ae14e6 " "
     user "user1.7"
     description "step 1.7"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieU'
    -     17: U        SHORT_BINSTRING 'BE3WH'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (c)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000007 33 sha1:0cd3f4b725517a5371429e2ef2f56ea54fe405fb
    +extension ""
    +obj 0000000000000004 33 sha1:4c3e1f41eebd1f56c0fef1f609d64e061a137f5a
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'c1.7'
    +     24: U    SHORT_BINSTRING 'd1.7'
          30: q    BINPUT     2
          32: .    STOP
       highest protocol among opcodes = 2
    @@ -489,27 +298,77 @@ obj 0000000000000007 33 sha1:0cd3f4b725517a5371429e2ef2f56ea54fe405fb
     txn 0285cbad2c5f9333 " "
     user "user1.8"
     description "step 1.8"
    -extension
    +extension ""
    +obj 0000000000000000 213 sha1:8ccd62e915379b196be62bdb500c4019dfb7825f
           0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-generator'
    -     19: q        BINPUT     2
    -     21: U        SHORT_BINSTRING 'zodb/py2 (c)'
    -     35: U        SHORT_BINSTRING 'x-cookieW'
    -     46: U        SHORT_BINSTRING 'HPFAQ'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    +      2: c    GLOBAL     'persistent.mapping PersistentMapping'
    +     40: q    BINPUT     1
    +     42: .    STOP
    +  highest protocol among opcodes = 2
    +     43: \x80 PROTO      2
    +     45: }    EMPTY_DICT
    +     46: q    BINPUT     2
    +     48: U    SHORT_BINSTRING 'data'
    +     54: q    BINPUT     3
    +     56: }    EMPTY_DICT
    +     57: q    BINPUT     4
    +     59: (    MARK
    +     60: U        SHORT_BINSTRING 'a'
    +     63: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x08'
    +     73: q        BINPUT     5
    +     75: c        GLOBAL     '__main__ Object'
    +     92: q        BINPUT     6
    +     94: \x86     TUPLE2
    +     95: Q        BINPERSID
    +     96: U        SHORT_BINSTRING 'c'
    +     99: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x02'
    +    109: q        BINPUT     7
    +    111: h        BINGET     6
    +    113: \x86     TUPLE2
    +    114: Q        BINPERSID
    +    115: U        SHORT_BINSTRING 'b'
    +    118: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x03'
    +    128: q        BINPUT     8
    +    130: h        BINGET     6
    +    132: \x86     TUPLE2
    +    133: Q        BINPERSID
    +    134: U        SHORT_BINSTRING 'e'
    +    137: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x07'
    +    147: q        BINPUT     9
    +    149: h        BINGET     6
    +    151: \x86     TUPLE2
    +    152: Q        BINPERSID
    +    153: U        SHORT_BINSTRING 'd'
    +    156: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x04'
    +    166: q        BINPUT     10
    +    168: h        BINGET     6
    +    170: \x86     TUPLE2
    +    171: Q        BINPERSID
    +    172: U        SHORT_BINSTRING 'g'
    +    175: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x06'
    +    185: q        BINPUT     11
    +    187: h        BINGET     6
    +    189: \x86     TUPLE2
    +    190: Q        BINPERSID
    +    191: U        SHORT_BINSTRING 'f'
    +    194: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x01'
    +    204: q        BINPUT     12
    +    206: h        BINGET     6
    +    208: \x86     TUPLE2
    +    209: Q        BINPERSID
    +    210: u        SETITEMS   (MARK at 59)
    +    211: s    SETITEM
    +    212: .    STOP
       highest protocol among opcodes = 2
    -obj 0000000000000007 33 sha1:13e366fb1d15d36a62099e6b835638407718229f
    +
    +obj 0000000000000008 33 sha1:7cffb67651540355d8467852ec6cabcb48d964aa
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'c1.8'
    +     24: U    SHORT_BINSTRING 'a1.8'
          30: q    BINPUT     2
          32: .    STOP
       highest protocol among opcodes = 2
    @@ -518,27 +377,15 @@ obj 0000000000000007 33 sha1:13e366fb1d15d36a62099e6b835638407718229f
     txn 0285cbad31111180 " "
     user "user1.9"
     description "step 1.9"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieQ'
    -     17: U        SHORT_BINSTRING 'DZM23'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (e)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000006 33 sha1:3ac37991a56061c7407cc093ee2a71eef4379131
    +extension ""
    +obj 0000000000000001 33 sha1:c32c4831eabc3a97810c4f925465c6093e4fb716
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'e1.9'
    +     24: U    SHORT_BINSTRING 'f1.9'
          30: q    BINPUT     2
          32: .    STOP
       highest protocol among opcodes = 2
    @@ -547,27 +394,15 @@ obj 0000000000000006 33 sha1:3ac37991a56061c7407cc093ee2a71eef4379131
     txn 0285cbad35c28fcc " "
     user "user1.10"
     description "step 1.10"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieO'
    -     17: U        SHORT_BINSTRING 'EIGHL'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (a)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000005 34 sha1:407cc5710a22f6c387df45aab613aa3673b221c6
    +extension ""
    +obj 0000000000000002 34 sha1:07fe4a745e127abf54f451d41fba5db7bd10ac9d
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'a1.10'
    +     24: U    SHORT_BINSTRING 'c1.10'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2
    @@ -576,27 +411,15 @@ obj 0000000000000005 34 sha1:407cc5710a22f6c387df45aab613aa3673b221c6
     txn 0285cbad3a740e19 " "
     user "user1.11"
     description "step 1.11"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookie2'
    -     17: U        SHORT_BINSTRING 'Z9RFC'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (c)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000007 34 sha1:88ab1add11652101077535c03b04e83fe4ddb88b
    +extension ""
    +obj 0000000000000001 34 sha1:2f0fc397cd9bdceb59cfb7e40b823ae3a81e2f7c
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'c1.11'
    +     24: U    SHORT_BINSTRING 'f1.11'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2
    @@ -605,20 +428,8 @@ obj 0000000000000007 34 sha1:88ab1add11652101077535c03b04e83fe4ddb88b
     txn 0285cbad3f258c66 " "
     user "user1.12"
     description "step 1.12"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookie7'
    -     17: U        SHORT_BINSTRING 'WGO4E'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (e)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000006 34 sha1:4808aef147f8ded08ffaae2ce04265506385e7f7
    +extension ""
    +obj 0000000000000007 34 sha1:4808aef147f8ded08ffaae2ce04265506385e7f7
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
    @@ -634,27 +445,15 @@ obj 0000000000000006 34 sha1:4808aef147f8ded08ffaae2ce04265506385e7f7
     txn 0285cbad43d70ab3 " "
     user "user1.13"
     description "step 1.13"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookie5'
    -     17: U        SHORT_BINSTRING '757DJ'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (g)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000003 34 sha1:a9f47880096587b359fa7ea6a0fd213e800a24a4
    +extension ""
    +obj 0000000000000008 34 sha1:656d65291d6e34225fe2c8213c2241b390e7487a
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'g1.13'
    +     24: U    SHORT_BINSTRING 'a1.13'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2
    @@ -663,27 +462,15 @@ obj 0000000000000003 34 sha1:a9f47880096587b359fa7ea6a0fd213e800a24a4
     txn 0285cbad48888900 " "
     user "user1.14"
     description "step 1.14"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieX'
    -     17: U        SHORT_BINSTRING '5EOVH'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (g)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000003 34 sha1:e5b3820378e102a61be2b5998ded3182c106c7db
    +extension ""
    +obj 0000000000000004 34 sha1:87a243d2e9bdd70a84129119894b7d25479f4abc
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'g1.14'
    +     24: U    SHORT_BINSTRING 'd1.14'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2
    @@ -692,27 +479,15 @@ obj 0000000000000003 34 sha1:e5b3820378e102a61be2b5998ded3182c106c7db
     txn 0285cbad4d3a074c " "
     user "user1.15"
     description "step 1.15"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieC'
    -     17: U        SHORT_BINSTRING 'HO7L7'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (d)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000002 34 sha1:f136bac1befa0fbd1ebd50218f8d9afe00b9b0a5
    +extension ""
    +obj 0000000000000006 34 sha1:2e9ebc331bf53c095e9573de64a9b31f2b340b2f
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'd1.15'
    +     24: U    SHORT_BINSTRING 'g1.15'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2
    @@ -721,27 +496,15 @@ obj 0000000000000002 34 sha1:f136bac1befa0fbd1ebd50218f8d9afe00b9b0a5
     txn 0285cbad51eb8599 " "
     user "user1.16"
     description "step 1.16"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieU'
    -     17: U        SHORT_BINSTRING 'T159S'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (g)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000003 34 sha1:778621ce5c5e97b65343b1ab0cc1a3ce5702fbc8
    +extension ""
    +obj 0000000000000003 34 sha1:86adb5f06801883ba2be7776f68bd8ab46b34dd8
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'g1.16'
    +     24: U    SHORT_BINSTRING 'b1.16'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2
    @@ -750,27 +513,15 @@ obj 0000000000000003 34 sha1:778621ce5c5e97b65343b1ab0cc1a3ce5702fbc8
     txn 0285cbad569d03e6 " "
     user "user1.17"
     description "step 1.17"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookie8'
    -     17: U        SHORT_BINSTRING 'T23V1'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (f)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000001 34 sha1:eb6d2d192f3d8fe47a1b2e8119d390ed580c3fb4
    +extension ""
    +obj 0000000000000002 34 sha1:033ab1c2cfacb42e1db63ec9fac8427c700cc3cb
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'f1.17'
    +     24: U    SHORT_BINSTRING 'c1.17'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2
    @@ -779,27 +530,15 @@ obj 0000000000000001 34 sha1:eb6d2d192f3d8fe47a1b2e8119d390ed580c3fb4
     txn 0285cbad5b4e8233 " "
     user "user1.18"
     description "step 1.18"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieY'
    -     17: U        SHORT_BINSTRING 'UB55N'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (a)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000005 34 sha1:921682b323eb62f109d052bc1dfd4ffe0dbf79db
    +extension ""
    +obj 0000000000000006 34 sha1:11f0228fea479a8dacdda2351f2720d005c04b06
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'a1.18'
    +     24: U    SHORT_BINSTRING 'g1.18'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2
    @@ -808,27 +547,15 @@ obj 0000000000000005 34 sha1:921682b323eb62f109d052bc1dfd4ffe0dbf79db
     txn 0285cbad60000080 " "
     user "user1.19"
     description "step 1.19"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieZ'
    -     17: U        SHORT_BINSTRING 'IKOSR'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (g)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000003 34 sha1:b0b31eb0b48548119153628eb3c6711d959e9f9b
    +extension ""
    +obj 0000000000000003 34 sha1:6f5ef8a80a64540885791a6b1e2d1a352ee91d1a
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'g1.19'
    +     24: U    SHORT_BINSTRING 'b1.19'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2
    @@ -837,27 +564,15 @@ obj 0000000000000003 34 sha1:b0b31eb0b48548119153628eb3c6711d959e9f9b
     txn 0285cbad64b17ecc " "
     user "user1.20"
     description "step 1.20"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieS'
    -     17: U        SHORT_BINSTRING '7JLTH'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (g)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000003 34 sha1:6bfd3298d0bea74cfa3d1f01bb722e958e3f1520
    +extension ""
    +obj 0000000000000004 34 sha1:1c032191dab251d941e739b3703f42ed7e43b246
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'g1.20'
    +     24: U    SHORT_BINSTRING 'd1.20'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2
    @@ -866,27 +581,15 @@ obj 0000000000000003 34 sha1:6bfd3298d0bea74cfa3d1f01bb722e958e3f1520
     txn 0285cbad6962fd19 " "
     user "user1.21"
     description "step 1.21"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieI'
    -     17: U        SHORT_BINSTRING 'USN06'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (e)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000006 34 sha1:0d4b4837500e84b190ea2f92b16ab8ec0c486db5
    +extension ""
    +obj 0000000000000003 34 sha1:d90118a669a7a9dbe6b779bcc61110df0cc97fd1
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'e1.21'
    +     24: U    SHORT_BINSTRING 'b1.21'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2
    @@ -895,27 +598,15 @@ obj 0000000000000006 34 sha1:0d4b4837500e84b190ea2f92b16ab8ec0c486db5
     txn 0285cbad6e147b66 " "
     user "user1.22"
     description "step 1.22"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookie2'
    -     17: U        SHORT_BINSTRING 'UXAET'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (a)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000005 34 sha1:eacbd02d0d78eece9d784da7f3fd0b2738ca6ce0
    +extension ""
    +obj 0000000000000006 34 sha1:cd7d6434b0aa8290342b60c85d7378cda0d19734
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'a1.22'
    +     24: U    SHORT_BINSTRING 'g1.22'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2
    @@ -924,27 +615,15 @@ obj 0000000000000005 34 sha1:eacbd02d0d78eece9d784da7f3fd0b2738ca6ce0
     txn 0285cbad72c5f9b3 " "
     user "user1.23"
     description "step 1.23"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieH'
    -     17: U        SHORT_BINSTRING 'AT11F'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (a)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000005 34 sha1:1b443228d5a434ddd9616ecb5aa90672c0ce9ba2
    +extension ""
    +obj 0000000000000001 34 sha1:230c0adc97facea312cd09aeb825f9a6c953e029
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'a1.23'
    +     24: U    SHORT_BINSTRING 'f1.23'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2
    @@ -953,27 +632,15 @@ obj 0000000000000005 34 sha1:1b443228d5a434ddd9616ecb5aa90672c0ce9ba2
     txn 0285cbad77777800 " "
     user "user1.24"
     description "step 1.24"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieD'
    -     17: U        SHORT_BINSTRING 'O5ZEM'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (f)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000001 34 sha1:b35a1826cc6cb71b9ddff043f0e8f88b4d90281f
    +extension ""
    +obj 0000000000000004 34 sha1:ec728760e33cbafcd21496354cbe752995dc02c4
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'f1.24'
    +     24: U    SHORT_BINSTRING 'd1.24'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2
    @@ -982,63 +649,27 @@ obj 0000000000000001 34 sha1:b35a1826cc6cb71b9ddff043f0e8f88b4d90281f
     txn 0285cbad7c28f64c " "
     user "root1.0\nYour\nMagesty "
     description "undo 1.0\nmore detailed description\n\nzzz ...\t"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookie3'
    -     17: U        SHORT_BINSTRING 'G51MM'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (undo AoXLrXLF+bM=)'
    -     69: u        SETITEMS   (MARK at 5)
    -     70: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000005 from 0285cbad6e147b66
    +extension ""
    +obj 0000000000000001 from 0285cbad3a740e19

     txn 0285cbad80da7499 " "
     user "root1.1\nYour\nMagesty "
     description "undo 1.1\nmore detailed description\n\nzzz ...\t\t"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieL'
    -     17: U        SHORT_BINSTRING 'CDRHV'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (undo AoXLrXd3eAA=)'
    -     69: u        SETITEMS   (MARK at 5)
    -     70: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000001 from 0285cbad569d03e6
    +extension ""
    +obj 0000000000000004 from 0285cbad64b17ecc

     txn 0285cbad858bf2e6 " "
     user "user"
     description "cyclic reference"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookie4'
    -     17: U        SHORT_BINSTRING 'C4OMS'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (cycle)'
    -     57: u        SETITEMS   (MARK at 5)
    -     58: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000002 41 sha1:1e2e3ac81badec749c2082a08d205c06c6bb5119
    +extension ""
    +obj 0000000000000008 41 sha1:ecd78bff79e5e10c04d6a14c8277d3fd5baba3a2
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x02'
    +     24: U    SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x08'
          34: q    BINPUT     2
          36: h    BINGET     1
          38: \x86 TUPLE2
    @@ -1051,7 +682,7 @@ txn 0285cbad8a3d7133 " "
     user ""
     description "predelete 3"
     extension ""
    -obj 0000000000000000 213 sha1:e278899979bad10d72962170790ea2a2f5865567
    +obj 0000000000000000 213 sha1:e8e6e66cf82c7cbff72efb7bed28826296e51a01
           0: \x80 PROTO      2
           2: c    GLOBAL     'persistent.mapping PersistentMapping'
          40: q    BINPUT     1
    @@ -1066,38 +697,38 @@ obj 0000000000000000 213 sha1:e278899979bad10d72962170790ea2a2f5865567
          57: q    BINPUT     4
          59: (    MARK
          60: U        SHORT_BINSTRING 'a'
    -     63: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x05'
    +     63: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x08'
          73: q        BINPUT     5
          75: c        GLOBAL     '__main__ Object'
          92: q        BINPUT     6
          94: \x86     TUPLE2
          95: Q        BINPERSID
          96: U        SHORT_BINSTRING 'c'
    -     99: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x07'
    +     99: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x02'
         109: q        BINPUT     7
         111: h        BINGET     6
         113: \x86     TUPLE2
         114: Q        BINPERSID
         115: U        SHORT_BINSTRING 'b'
    -    118: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x08'
    +    118: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\t'
         128: q        BINPUT     8
         130: h        BINGET     6
         132: \x86     TUPLE2
         133: Q        BINPERSID
         134: U        SHORT_BINSTRING 'e'
    -    137: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x06'
    +    137: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x07'
         147: q        BINPUT     9
         149: h        BINGET     6
         151: \x86     TUPLE2
         152: Q        BINPERSID
         153: U        SHORT_BINSTRING 'd'
    -    156: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x02'
    +    156: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x04'
         166: q        BINPUT     10
         168: h        BINGET     6
         170: \x86     TUPLE2
         171: Q        BINPERSID
         172: U        SHORT_BINSTRING 'g'
    -    175: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\t'
    +    175: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x06'
         185: q        BINPUT     11
         187: h        BINGET     6
         189: \x86     TUPLE2
    @@ -1113,14 +744,14 @@ obj 0000000000000000 213 sha1:e278899979bad10d72962170790ea2a2f5865567
         212: .    STOP
       highest protocol among opcodes = 2

    -obj 0000000000000009 32 sha1:38aaea7061f311a5ff41e144ea56df2c8f66435c
    +obj 0000000000000009 32 sha1:94f4c80027cdf77affb7dd9f26b634975b4619e4
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'g1*'
    +     24: U    SHORT_BINSTRING 'b1*'
          29: q    BINPUT     2
          31: .    STOP
       highest protocol among opcodes = 2
    @@ -1129,45 +760,21 @@ obj 0000000000000009 32 sha1:38aaea7061f311a5ff41e144ea56df2c8f66435c
     txn 0285cbad8eeeef80 " "
     user "root1\nYour\nRoyal\nMagesty' \x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\r\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f"
     description "delete 1\nalpha beta gamma'delta\"lambda\n\nqqq ..."
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieS'
    -     17: U        SHORT_BINSTRING 'XVOTI'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (delete 3)'
    -     60: u        SETITEMS   (MARK at 5)
    -     61: .    STOP
    -  highest protocol among opcodes = 2
    +extension ""
     obj 0000000000000003 delete

     txn 0285cbadcbf25966 " "
     user "user2.0"
     description "step 2.0"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookie1'
    -     17: U        SHORT_BINSTRING 'GRGS2'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (f)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000001 33 sha1:7b5599bdbf192e2d33e2597b52c8a72a751ddd13
    +extension ""
    +obj 0000000000000004 33 sha1:aff1248f33b29d65fe0b038d7dc11db007e2690d
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'f2.0'
    +     24: U    SHORT_BINSTRING 'd2.0'
          30: q    BINPUT     2
          32: .    STOP
       highest protocol among opcodes = 2
    @@ -1176,27 +783,15 @@ obj 0000000000000001 33 sha1:7b5599bdbf192e2d33e2597b52c8a72a751ddd13
     txn 0285cbadd0a3d7b3 " "
     user "user2.1"
     description "step 2.1"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookie3'
    -     17: U        SHORT_BINSTRING 'WYNK7'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (d)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000002 33 sha1:50b0cf792f2fdc3fbfc5f47f148784924350e31c
    +extension ""
    +obj 0000000000000006 33 sha1:2a2f21f6f3480aef6afd1398bec7f6bffa43109c
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'd2.1'
    +     24: U    SHORT_BINSTRING 'g2.1'
          30: q    BINPUT     2
          32: .    STOP
       highest protocol among opcodes = 2
    @@ -1205,27 +800,15 @@ obj 0000000000000002 33 sha1:50b0cf792f2fdc3fbfc5f47f148784924350e31c
     txn 0285cbadd5555600 " "
     user "user2.2"
     description "step 2.2"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieF'
    -     17: U        SHORT_BINSTRING 'SPFA4'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (g)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000009 33 sha1:71f1255a9751e0f223f079552e182cf26b27c0a6
    +extension ""
    +obj 0000000000000008 33 sha1:07e79c0eb72eea524bbfbce530b0671a4f90f483
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'g2.2'
    +     24: U    SHORT_BINSTRING 'a2.2'
          30: q    BINPUT     2
          32: .    STOP
       highest protocol among opcodes = 2
    @@ -1234,27 +817,15 @@ obj 0000000000000009 33 sha1:71f1255a9751e0f223f079552e182cf26b27c0a6
     txn 0285cbadda06d44c " "
     user "user2.3"
     description "step 2.3"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookie1'
    -     17: U        SHORT_BINSTRING 'XE3RQ'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (g)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000009 33 sha1:e6236b8f0a4a2201c0c2375a8f360905108eff2d
    +extension ""
    +obj 0000000000000004 33 sha1:9985268077ca849a615e15ed1b37634875749695
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'g2.3'
    +     24: U    SHORT_BINSTRING 'd2.3'
          30: q    BINPUT     2
          32: .    STOP
       highest protocol among opcodes = 2
    @@ -1263,20 +834,8 @@ obj 0000000000000009 33 sha1:e6236b8f0a4a2201c0c2375a8f360905108eff2d
     txn 0285cbaddeb85299 " "
     user "user2.4"
     description "step 2.4"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookie2'
    -     17: U        SHORT_BINSTRING '1XYQ2'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (e)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000006 33 sha1:55a37439e3dc66552d680833af332b8be83bfc2a
    +extension ""
    +obj 0000000000000007 33 sha1:55a37439e3dc66552d680833af332b8be83bfc2a
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
    @@ -1292,27 +851,15 @@ obj 0000000000000006 33 sha1:55a37439e3dc66552d680833af332b8be83bfc2a
     txn 0285cbade369d0e6 " "
     user "user2.5"
     description "step 2.5"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieW'
    -     17: U        SHORT_BINSTRING 'C0ZT2'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (a)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000005 33 sha1:6beb5d1ca083744ff1e8a13c0bee70c2df54a05c
    +extension ""
    +obj 0000000000000004 33 sha1:2e472bec634f703fc24e5192114b0c61364d9273
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'a2.5'
    +     24: U    SHORT_BINSTRING 'd2.5'
          30: q    BINPUT     2
          32: .    STOP
       highest protocol among opcodes = 2
    @@ -1321,27 +868,15 @@ obj 0000000000000005 33 sha1:6beb5d1ca083744ff1e8a13c0bee70c2df54a05c
     txn 0285cbade81b4f33 " "
     user "user2.6"
     description "step 2.6"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookie0'
    -     17: U        SHORT_BINSTRING 'OX40D'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (b)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000008 33 sha1:2a3221e27ac8fbf15ab75b38a9a65e727d237355
    +extension ""
    +obj 0000000000000001 33 sha1:e0148787fb3ffe52ef3ba85ad82b6b8afa47e20f
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'b2.6'
    +     24: U    SHORT_BINSTRING 'f2.6'
          30: q    BINPUT     2
          32: .    STOP
       highest protocol among opcodes = 2
    @@ -1350,27 +885,15 @@ obj 0000000000000008 33 sha1:2a3221e27ac8fbf15ab75b38a9a65e727d237355
     txn 0285cbadeccccd80 " "
     user "user2.7"
     description "step 2.7"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieY'
    -     17: U        SHORT_BINSTRING '64CY4'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (g)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000009 33 sha1:408fddc8c7255c5e2ed94c239ac57c211ab94b6d
    +extension ""
    +obj 0000000000000004 33 sha1:9472357211e402a8dfcda8b72f7ef98c2b8d8b20
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'g2.7'
    +     24: U    SHORT_BINSTRING 'd2.7'
          30: q    BINPUT     2
          32: .    STOP
       highest protocol among opcodes = 2
    @@ -1379,27 +902,15 @@ obj 0000000000000009 33 sha1:408fddc8c7255c5e2ed94c239ac57c211ab94b6d
     txn 0285cbadf17e4bcc " "
     user "user2.8"
     description "step 2.8"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieZ'
    -     17: U        SHORT_BINSTRING 'AXYM6'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (d)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000002 33 sha1:72eda0cdae0addbec9472e28b5a9a91ecdf41bbf
    +extension ""
    +obj 0000000000000006 33 sha1:d57709ac596de41959e36e1dd6902a853213267e
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'd2.8'
    +     24: U    SHORT_BINSTRING 'g2.8'
          30: q    BINPUT     2
          32: .    STOP
       highest protocol among opcodes = 2
    @@ -1408,20 +919,8 @@ obj 0000000000000002 33 sha1:72eda0cdae0addbec9472e28b5a9a91ecdf41bbf
     txn 0285cbadf62fca19 " "
     user "user2.9"
     description "step 2.9"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookie8'
    -     17: U        SHORT_BINSTRING '5WYSB'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (e)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000006 33 sha1:f1d87ba386f57291ecc925020a05df06caedb278
    +extension ""
    +obj 0000000000000007 33 sha1:f1d87ba386f57291ecc925020a05df06caedb278
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
    @@ -1437,27 +936,15 @@ obj 0000000000000006 33 sha1:f1d87ba386f57291ecc925020a05df06caedb278
     txn 0285cbadfae14866 " "
     user "user2.10"
     description "step 2.10"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookie2'
    -     17: U        SHORT_BINSTRING 'F1402'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (c)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000007 34 sha1:6696fa0434fadb645687c74c8561f0f55fce1fd6
    +extension ""
    +obj 0000000000000007 34 sha1:5118b5ada1ab6ce6852eef392212ea9300ac6f06
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'c2.10'
    +     24: U    SHORT_BINSTRING 'e2.10'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2
    @@ -1466,20 +953,8 @@ obj 0000000000000007 34 sha1:6696fa0434fadb645687c74c8561f0f55fce1fd6
     txn 0285cbadff92c6b3 " "
     user "user2.11"
     description "step 2.11"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieG'
    -     17: U        SHORT_BINSTRING 'Q5FM3'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (d)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000002 34 sha1:14e8b27b3bc8bf5b4d86ca162cc1c912a29a1c05
    +extension ""
    +obj 0000000000000004 34 sha1:14e8b27b3bc8bf5b4d86ca162cc1c912a29a1c05
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
    @@ -1495,27 +970,15 @@ obj 0000000000000002 34 sha1:14e8b27b3bc8bf5b4d86ca162cc1c912a29a1c05
     txn 0285cbae04444500 " "
     user "user2.12"
     description "step 2.12"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookie7'
    -     17: U        SHORT_BINSTRING '2EFQB'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (g)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000009 34 sha1:db269b90a0df33aa7d411c672f93fb7d86bbdb87
    +extension ""
    +obj 0000000000000007 34 sha1:60c6854b7737f5bbc7569c8b6a694910ed370ccc
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'g2.12'
    +     24: U    SHORT_BINSTRING 'e2.12'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2
    @@ -1524,27 +987,15 @@ obj 0000000000000009 34 sha1:db269b90a0df33aa7d411c672f93fb7d86bbdb87
     txn 0285cbae08f5c34c " "
     user "user2.13"
     description "step 2.13"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieS'
    -     17: U        SHORT_BINSTRING 'YS9KO'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (d)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000002 34 sha1:4b28f9e97ff4f61f3dfba30b9f7aceb4913215ce
    +extension ""
    +obj 0000000000000002 34 sha1:5d89801d288c5238f605784e7c71b2d61598d362
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'd2.13'
    +     24: U    SHORT_BINSTRING 'c2.13'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2
    @@ -1553,27 +1004,15 @@ obj 0000000000000002 34 sha1:4b28f9e97ff4f61f3dfba30b9f7aceb4913215ce
     txn 0285cbae0da74199 " "
     user "user2.14"
     description "step 2.14"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookie5'
    -     17: U        SHORT_BINSTRING 'RF8GX'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (c)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000007 34 sha1:c3eabecf360015b4b7555abc3a0dc0cea77fe7ed
    +extension ""
    +obj 0000000000000007 34 sha1:0a27d685d77313b1a2b7c3478888a98798847077
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'c2.14'
    +     24: U    SHORT_BINSTRING 'e2.14'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2
    @@ -1582,27 +1021,15 @@ obj 0000000000000007 34 sha1:c3eabecf360015b4b7555abc3a0dc0cea77fe7ed
     txn 0285cbae1258bfe6 " "
     user "user2.15"
     description "step 2.15"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookie0'
    -     17: U        SHORT_BINSTRING 'H70PM'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (e)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000006 34 sha1:25ffaeb6090581d72bce075a765d3cf4198af90f
    +extension ""
    +obj 0000000000000002 34 sha1:ae3975f91e13b4ec60e6810006be027149642926
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'e2.15'
    +     24: U    SHORT_BINSTRING 'c2.15'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2
    @@ -1611,27 +1038,15 @@ obj 0000000000000006 34 sha1:25ffaeb6090581d72bce075a765d3cf4198af90f
     txn 0285cbae170a3e33 " "
     user "user2.16"
     description "step 2.16"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-generator'
    -     19: q        BINPUT     2
    -     21: U        SHORT_BINSTRING 'zodb/py2 (f)'
    -     35: U        SHORT_BINSTRING 'x-cookieO'
    -     46: U        SHORT_BINSTRING 'MJ5PG'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000001 34 sha1:e934438dede49d14ee2d1d2afa8fa18774547764
    +extension ""
    +obj 0000000000000009 34 sha1:0f253572ebd02bdd419b287ac75113bc8213ef83
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'f2.16'
    +     24: U    SHORT_BINSTRING 'b2.16'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2
    @@ -1640,20 +1055,8 @@ obj 0000000000000001 34 sha1:e934438dede49d14ee2d1d2afa8fa18774547764
     txn 0285cbae1bbbbc80 " "
     user "user2.17"
     description "step 2.17"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookie1'
    -     17: U        SHORT_BINSTRING 'RAZ4V'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (b)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000008 34 sha1:9961f82b3f01204f80efbb3b62a2b98d9d3202fa
    +extension ""
    +obj 0000000000000009 34 sha1:9961f82b3f01204f80efbb3b62a2b98d9d3202fa
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
    @@ -1669,27 +1072,15 @@ obj 0000000000000008 34 sha1:9961f82b3f01204f80efbb3b62a2b98d9d3202fa
     txn 0285cbae206d3acc " "
     user "user2.18"
     description "step 2.18"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieR'
    -     17: U        SHORT_BINSTRING 'KE39A'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (d)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000002 34 sha1:5294513e1e00c7de532f4f90068b2147bf87f673
    +extension ""
    +obj 0000000000000007 34 sha1:00cce52a596916011d8935c4e53dcb04510af2d9
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'd2.18'
    +     24: U    SHORT_BINSTRING 'e2.18'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2
    @@ -1698,20 +1089,8 @@ obj 0000000000000002 34 sha1:5294513e1e00c7de532f4f90068b2147bf87f673
     txn 0285cbae251eb919 " "
     user "user2.19"
     description "step 2.19"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookie8'
    -     17: U        SHORT_BINSTRING '1SBCJ'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (e)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000006 34 sha1:523ec17c6d74016e3464d52bb7c7b7baa4b82a20
    +extension ""
    +obj 0000000000000007 34 sha1:523ec17c6d74016e3464d52bb7c7b7baa4b82a20
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
    @@ -1727,27 +1106,15 @@ obj 0000000000000006 34 sha1:523ec17c6d74016e3464d52bb7c7b7baa4b82a20
     txn 0285cbae29d03766 " "
     user "user2.20"
     description "step 2.20"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieJ'
    -     17: U        SHORT_BINSTRING 'EAIKM'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (b)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000008 34 sha1:14b17f0e944432782cb270205b2e96948d112619
    +extension ""
    +obj 0000000000000004 34 sha1:9cf3a2031b4e9af93e7fd40e58dbceedc753b7d6
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'b2.20'
    +     24: U    SHORT_BINSTRING 'd2.20'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2
    @@ -1756,27 +1123,15 @@ obj 0000000000000008 34 sha1:14b17f0e944432782cb270205b2e96948d112619
     txn 0285cbae2e81b5b3 " "
     user "user2.21"
     description "step 2.21"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieM'
    -     17: U        SHORT_BINSTRING 'ESSAD'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (e)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000006 34 sha1:27744ea516240e0d00be75f26af9698f842bdda5
    +extension ""
    +obj 0000000000000008 34 sha1:330a069412b6cfb00a43da001b600b7f6b2380e6
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'e2.21'
    +     24: U    SHORT_BINSTRING 'a2.21'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2
    @@ -1785,27 +1140,15 @@ obj 0000000000000006 34 sha1:27744ea516240e0d00be75f26af9698f842bdda5
     txn 0285cbae33333400 " "
     user "user2.22"
     description "step 2.22"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieH'
    -     17: U        SHORT_BINSTRING 'DL5OC'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (e)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000006 34 sha1:a3f303ddd4f2fb9369f6fbbb38ae8030f7f8188d
    +extension ""
    +obj 0000000000000001 34 sha1:bf2d0d8f4cd81e1592001eb3c265a22894cdb51b
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'e2.22'
    +     24: U    SHORT_BINSTRING 'f2.22'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2
    @@ -1814,27 +1157,15 @@ obj 0000000000000006 34 sha1:a3f303ddd4f2fb9369f6fbbb38ae8030f7f8188d
     txn 0285cbae37e4b24c " "
     user "user2.23"
     description "step 2.23"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieQ'
    -     17: U        SHORT_BINSTRING 'PBN2A'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (d)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000002 34 sha1:343bed4b31f4fe69a92ee51d28fd7b9cfd6ecb8b
    +extension ""
    +obj 0000000000000006 34 sha1:c47e0f1415e14f41016809ac3a4323745ad79170
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'd2.23'
    +     24: U    SHORT_BINSTRING 'g2.23'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2
    @@ -1843,84 +1174,36 @@ obj 0000000000000002 34 sha1:343bed4b31f4fe69a92ee51d28fd7b9cfd6ecb8b
     txn 0285cbae3c963099 " "
     user "user2.24"
     description "step 2.24"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookie2'
    -     17: U        SHORT_BINSTRING '0GV0I'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (e)'
    -     53: u        SETITEMS   (MARK at 5)
    -     54: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000006 34 sha1:8804c60dc27b2e2f6908e2a099a5c5d4b5abc843
    +extension ""
    +obj 0000000000000006 34 sha1:2030a0ccc56595b70aac033e70c899060dbfb0f9
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'e2.24'
    +     24: U    SHORT_BINSTRING 'g2.24'
          31: q    BINPUT     2
          33: .    STOP
       highest protocol among opcodes = 2

    -txn 0285cbae4147aee6 " "
    +txn 0285cbae45f92d33 " "
     user "root2.0\nYour\nMagesty "
     description "undo 2.0\nmore detailed description\n\nzzz ...\t\t"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieM'
    -     17: U        SHORT_BINSTRING 'OQO01'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (undo AoXLrjfkskw=)'
    -     69: u        SETITEMS   (MARK at 5)
    -     70: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000002 from 0285cbae206d3acc
    +extension ""
    +obj 0000000000000001 from 0285cbade81b4f33

    -txn 0285cbae45f92d33 " "
    +txn 0285cbae4aaaab80 " "
     user "root2.1\nYour\nMagesty "
     description "undo 2.1\nmore detailed description\n\nzzz ...\t\t\t"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieA'
    -     17: U        SHORT_BINSTRING 'VPQ8R'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (undo AoXLrjyWMJk=)'
    -     69: u        SETITEMS   (MARK at 5)
    -     70: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000006 from 0285cbae33333400
    +extension ""
    +obj 0000000000000006 from 0285cbae37e4b24c

    -txn 0285cbae4aaaab80 " "
    +txn 0285cbae4f5c29cc " "
     user "user"
     description "cyclic reference"
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-generator'
    -     19: q        BINPUT     2
    -     21: U        SHORT_BINSTRING 'zodb/py2 (cycle)'
    -     39: U        SHORT_BINSTRING 'x-cookieG'
    -     50: U        SHORT_BINSTRING 'B6FWF'
    -     57: u        SETITEMS   (MARK at 5)
    -     58: .    STOP
    -  highest protocol among opcodes = 2
    +extension ""
     obj 0000000000000006 41 sha1:863d327e4b795efff7dff75bb73c0d20ea3981aa
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
    @@ -1937,11 +1220,11 @@ obj 0000000000000006 41 sha1:863d327e4b795efff7dff75bb73c0d20ea3981aa
       highest protocol among opcodes = 2

    -txn 0285cbae4f5c29cc " "
    +txn 0285cbae540da819 " "
     user ""
    -description "predelete 6"
    +description "predelete 1"
     extension ""
    -obj 0000000000000000 213 sha1:b44d53e1b6cc465c4ab3ba2a3384a80fbba4eb8a
    +obj 0000000000000000 213 sha1:ae6936a4e7c9f3f748d8ecf28186e259897651dd
           0: \x80 PROTO      2
           2: c    GLOBAL     'persistent.mapping PersistentMapping'
          40: q    BINPUT     1
    @@ -1956,44 +1239,44 @@ obj 0000000000000000 213 sha1:b44d53e1b6cc465c4ab3ba2a3384a80fbba4eb8a
          57: q    BINPUT     4
          59: (    MARK
          60: U        SHORT_BINSTRING 'a'
    -     63: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x05'
    +     63: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x08'
          73: q        BINPUT     5
          75: c        GLOBAL     '__main__ Object'
          92: q        BINPUT     6
          94: \x86     TUPLE2
          95: Q        BINPERSID
          96: U        SHORT_BINSTRING 'c'
    -     99: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x07'
    +     99: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x02'
         109: q        BINPUT     7
         111: h        BINGET     6
         113: \x86     TUPLE2
         114: Q        BINPERSID
         115: U        SHORT_BINSTRING 'b'
    -    118: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x08'
    +    118: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\t'
         128: q        BINPUT     8
         130: h        BINGET     6
         132: \x86     TUPLE2
         133: Q        BINPERSID
         134: U        SHORT_BINSTRING 'e'
    -    137: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\n'
    +    137: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x07'
         147: q        BINPUT     9
         149: h        BINGET     6
         151: \x86     TUPLE2
         152: Q        BINPERSID
         153: U        SHORT_BINSTRING 'd'
    -    156: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x02'
    +    156: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x04'
         166: q        BINPUT     10
         168: h        BINGET     6
         170: \x86     TUPLE2
         171: Q        BINPERSID
         172: U        SHORT_BINSTRING 'g'
    -    175: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\t'
    +    175: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x06'
         185: q        BINPUT     11
         187: h        BINGET     6
         189: \x86     TUPLE2
         190: Q        BINPERSID
         191: U        SHORT_BINSTRING 'f'
    -    194: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x01'
    +    194: U        SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\n'
         204: q        BINPUT     12
         206: h        BINGET     6
         208: \x86     TUPLE2
    @@ -2003,34 +1286,22 @@ obj 0000000000000000 213 sha1:b44d53e1b6cc465c4ab3ba2a3384a80fbba4eb8a
         212: .    STOP
       highest protocol among opcodes = 2

    -obj 000000000000000a 32 sha1:35a18f6ce20260014618957689b770b74d7b3c78
    +obj 000000000000000a 32 sha1:da5c7f574b5e6a64d0d58314a6939ef761266d41
           0: \x80 PROTO      2
           2: c    GLOBAL     '__main__ Object'
          19: q    BINPUT     1
          21: .    STOP
       highest protocol among opcodes = 2
          22: \x80 PROTO      2
    -     24: U    SHORT_BINSTRING 'e2*'
    +     24: U    SHORT_BINSTRING 'f2*'
          29: q    BINPUT     2
          31: .    STOP
       highest protocol among opcodes = 2

    -txn 0285cbae540da819 " "
    +txn 0285cbae58bf2666 " "
     user "root2\nYour\nRoyal\nMagesty' \x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\r\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f"
     description "delete 2\nalpha beta gamma'delta\"lambda\n\nqqq ..."
    -extension
    -      0: \x80 PROTO      2
    -      2: }    EMPTY_DICT
    -      3: q    BINPUT     1
    -      5: (    MARK
    -      6: U        SHORT_BINSTRING 'x-cookieT'
    -     17: U        SHORT_BINSTRING '4WFSD'
    -     24: U        SHORT_BINSTRING 'x-generator'
    -     37: q        BINPUT     2
    -     39: U        SHORT_BINSTRING 'zodb/py2 (delete 6)'
    -     60: u        SETITEMS   (MARK at 5)
    -     61: .    STOP
    -  highest protocol among opcodes = 2
    -obj 0000000000000006 delete
    +extension ""
    +obj 0000000000000001 delete

395d8c27

26 Jun, 2024 1 commit

zodbdump: Fix pickle disassembly if state part of zpickle refers to class part · fbb2a3d9

Kirill Smelkov authored Jun 26, 2024

I've tried to run `zodb dump --pretty=zpickledis` on wendelin.core test
data in WCFS(*) and hit the following failure:

    (z-dev) kirr@deca:~/src/wendelin/wendelin.core/wcfs/internal/zdata/testdata$ zodb dump --pretty=zpickledis zblk.fs
    ...
    obj 0000000000000005 685 sha1:865171b709f575b355afd2cc9e1f32b9781c6510
    Traceback (most recent call last):
      File "/home/kirr/src/wendelin/venv/z-dev/bin/zodb", line 11, in <module>
        load_entry_point('zodbtools', 'console_scripts', 'zodb')()
      File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodb.py", line 129, in main
        return command_module.main(argv)
      File "<decorator-gen-3>", line 2, in main
      File "/home/kirr/src/wendelin/venv/z-dev/lib/python2.7/site-packages/golang/__init__.py", line 103, in _
        return f(*argv, **kw)
      File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodbdump.py", line 341, in main
        zodbdump(stor, tidmin, tidmax, hashonly, pretty)
      File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodbdump.py", line 167, in zodbdump
        pickletools.dis(dataf, disf) # state
      File "/usr/lib/python2.7/pickletools.py", line 2005, in dis
        raise ValueError(errormsg)
    ValueError: memo key 1 has never been stored into

The problem turned out to be due to that state part of zpickle is
referring to another object with the same class as already saved
in class part of zpickle, so that class was being referred to via GET
matching corresponding PUT done in the class part, but our zpickledis
handler did not shared the memo in between those two parts and so the
GET became unmatched.

In more details the problem is illustrated by the following zpickle that
corresponds to Object.value referring to the same Object. The first part
of zpickle contains class part and refers to __main__.Object global
with putting it into memo[1]. The second part of zpickle contains state
part and refers to that object by `(Object, 7) PERSID` where Object is
retrieved via memo[1] GET:

    obj 0000000000000007 41 sha1:7108c96ccb9cbeaab1164d533174c300e51309f9
          0: \x80 PROTO      2
          2: c    GLOBAL     '__main__ Object'
         19: q    BINPUT     1                   <-- NOTE
         21: .    STOP
      highest protocol among opcodes = 2
         22: \x80 PROTO      2
         24: U    SHORT_BINSTRING '\x00\x00\x00\x00\x00\x00\x00\x07'
         34: q    BINPUT     2
         36: h    BINGET     1                   <-- NOTE
         38: \x86 TUPLE2
         39: Q    BINPERSID
         40: .    STOP
      highest protocol among opcodes = 2

To handle such zpickles well we need to share the memo when dumping
class and state disassemblies similarly to how ZODB does in its
ObjectWriter._dump:

https://github.com/zopefoundation/ZODB/blob/5.8.1-0-g72cebe6bc/src/ZODB/serialize.py#L436-L443

Pickletools.dis has explicit support for using shared memo - originally
added in https://github.com/python/cpython/commit/62235e701e37 and
likely motivated by ZODB use-case.

(*) https://lab.nexedi.com/nexedi/wendelin.core/-/blob/07087ec8/wcfs/internal/zdata/testdata/zblk.fs
    generated by wendelin.core@2c152d41

/reviewed-by @jerome
/reviewed-on !28

fbb2a3d9

16 Feb, 2024 1 commit
- Release 0.0.0.dev9 · 513c296c
  Jérome Perrin authored Feb 16, 2024
```
Co-authored-by: Kirill Smelkov <kirr@nexedi.com>
```
  513c296c
01 Sep, 2023 3 commits

zodbcommit: include the status of transaction · a9853038

Jérome Perrin authored Sep 01, 2023

even though the interface of IStorageRestorable.tpc_begin does not
have a "status" argument, it is described in the notes below that the
actual implementation uses it:

https://github.com/zopefoundation/ZODB/blob/0632974d/src/ZODB/interfaces.py#L950-L956

This is used by FileStorage:

https://github.com/zopefoundation/ZODB/blob/0632974d/src/ZODB/FileStorage/format.py#L30-L39

and the storage methods seem to accept this argument:

https://github.com/zopefoundation/ZODB/blob/0632974d/src/ZODB/BaseStorage.py#L182
https://github.com/zopefoundation/ZEO/blob/e5637818/src/ZEO/ClientStorage.py#L888
https://lab.nexedi.com/nexedi/neoppod/blob/fd87e153/neo/client/app.py#L473

Propagating the status fixes some cases where restoring commits did not
recreate a storage that is byte-to-byte equivalent. This happened with
a FileStorage that was packed and contained transactions with "p"
status.
Co-authored-by: Kirill Smelkov <kirr@nexedi.com>
Reviewed-on: !24

a9853038

test/gen_testdata: Generate transactions with both " " and "p" status · 1b480c93

Kirill Smelkov authored Sep 01, 2023

Until now we were generating only regular transactions with " " status
and this does not cover e.g. restore case when it needs to replicate
packed transaction: instead of recreating it bit-to-bit exactly as
original with "p" status, restore recreates it with " " status, breaking
restore promise.

Adjusting testdata this way exposes that bug in restore:

    ======================================== FAILURES ========================================
    ________________________________________ test_zodbrestore[!zext] ________________________________________

    tmpdir = local('/tmp/pytest-of-kirr/pytest-17/test_zodbrestore__zext_0'), zext = <function _ at 0x7fd6b7a03750>

        @func
        def test_zodbrestore(tmpdir, zext):
            zkind = '_!zext' if zext.disabled else ''

            # restore from testdata/1.zdump.ok and verify it gives result that is
            # bit-to-bit identical to testdata/1.fs
            tdata = dirname(__file__) + "/testdata"
            @func
            def _():
                zdump = open("%s/1%s.zdump.raw.ok" % (tdata, zkind), 'rb')
                defer(zdump.close)

                stor = storageFromURL('%s/2.fs' % tmpdir)
                defer(stor.close)

                zodbrestore(stor, zdump)
            _()

            zfs1 = readfile(fs1_testdata_py23(tmpdir, "%s/1%s.fs" % (tdata, zkind)))
            zfs2 = readfile("%s/2.fs" % tmpdir)
    >       assert zfs1 == zfs2
    E       assert 'FS21\x02\x85...0\x00\x00\xb2' == 'FS21\x02\x85\...0\x00\x00\xb2'
    E         Skipping 49 identical leading characters in diff, use -v to show
    E         Skipping 22871 identical trailing characters in diff, use -v to show
    E         - 0\x00\x00tp\x00\x08\x00\t\x00\x00user0.15step 0.15\x00\x00\x00\x00\x00\x00\x00\x03\x02\x85\xcb\xac\x83i\xd0f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00"\x80\x02c__main__
    E         ?           ^
    E         + 0\x00\x00t \x00\x08\x00\t\x00\x00user0.15step 0.15\x00\x00\x00\x00\x00\x00\x00\x03\x02\x85\xcb\xac\x83i\xd0f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00...
    E
    E         ...Full output truncated (39 lines hidden), use '-vv' to show

    test_restore.py:53: AssertionError

Having "p" transactions in the testdata will also make sure that all tools
should handle such transactions well.

The problem of restore not handling "p" status properly was reported by Jérome
at !24.

In the next patch we will fix that problem.

/reviewed-by @jerome
/reviewed-on !24

1b480c93

test/gen_testdata: Adjust it to match current testdata/ state · 37786d10

Kirill Smelkov authored Sep 01, 2023

In 80559a94 ("zodbdump: support --pretty option with a format to show
pickles disassembly") we added support for zodbdump --pretty and
adjusted files in testdata/ to be named like 1.zdump.{raw,zpickledis}.ok
instead of just 1.zdump.ok. However, that renaming and
generation of 1.zdump.zpickledis.ok, it seems, were done by hand, because
rerunning gen_testdata.py still regenerates old 1.zdump.ok. It seems
that during !22 I
missed that gen_testdata.py was not updated.

-> Fix it.

Running gen_testdata.py with py2 and ZODB 5.8.1 regenerates *.fs and
*.ok files in testdata/ in exactly the same state they were.

/reviewed-by @jerome
/reviewed-on !24

37786d10

08 Sep, 2022 1 commit

Port zodbtools to py3 · 7ae5ff82

Kirill Smelkov authored Sep 08, 2022

Penultimate patch needs `bstr` from pygolang to work ok (see
kirr/pygolang@c9648c44), but it won't hurt
if we merge this without waiting for pygolang bits because without bstr
zodbtools continues to work ok on py2, and it will be py3 mode which
will not work fully ok.

Previous discussions and py3 porting attempts:

- !8 (comment 73726)
- !12
- conversation from !13 (comment 81553) to !13 (comment 81874)
- !19 (comment 129023)
- kirr/zodbtools@42799cf6 (comment 166403)

/reviewed-by @jerome
/reviewed-on !23

7ae5ff82

07 Sep, 2022 7 commits

analyze: test: Fix tidmin thinko in "empty range" test · 65ebbe7b

Kirill Smelkov authored Sep 07, 2022

Empty-range test added in b4824ad5 (analyze: fix ZeroDivisionErrors when
report is empty) intended to use 0xffffffffffffffff TID, but used just
'ffffffffffffffff' string instead. It was passing on py2 partly by luck,
but on py3 it fails because tidmin type is mismatched:

    _______________________________ test_zodbanalyze _______________________________

    tmpdir = local('/tmp/pytest-of-kirr/pytest-30/test_zodbanalyze0')
    capsys = <_pytest.capture.CaptureFixture object at 0x7f7bb3f9a4f0>

        def test_zodbanalyze(tmpdir, capsys):
            ...

            # empty range
            report(
    >           analyze(
                    tfs1,
                    use_dbm=False,
                    delta_fs=False,
                    tidmin="ffffffffffffffff",
                    tidmax=None,
                ),
                csv=False,
            )

    zodbtools/test/test_analyze.py:68:
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    ../../venv/py3.venv/lib/python3.9/site-packages/decorator.py:232: in fun
        return caller(func, *(extras + args), **kw)
    ../../../tools/go/pygolang/golang/__init__.py:103: in _
        return f(*argv, **kw)
    zodbtools/zodbanalyze.py:181: in analyze
        fsi = fs.iterator(tidmin, tidmax)
    ../ZODB/src/ZODB/FileStorage/FileStorage.py:1381: in iterator
        return FileIterator(self._file_name, start, stop)
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

    self = <ZODB.FileStorage.FileStorage.FileIterator object at 0x7f7bb348c6d0>
    filename = '/tmp/pytest-of-kirr/pytest-30/test_zodbanalyze0/1.fs'
    start = 'ffffffffffffffff', stop = None, pos = 4

        def __init__(self, filename, start=None, stop=None, pos=4):
            assert isinstance(filename, STRING_TYPES)
            file = open(filename, 'rb')
            self._file = file
            self._file_name = filename
            if file.read(4) != packed_version:
                raise FileStorageFormatError(file.name)
            file.seek(0, 2)
            self._file_size = file.tell()
            if (pos < 4) or pos > self._file_size:
                raise ValueError("Given position is greater than the file size",
                                 pos, self._file_size)
            self._pos = pos
    >       assert start is None or isinstance(start, bytes)
    E       AssertionError

    ../ZODB/src/ZODB/FileStorage/FileStorage.py:1816: AssertionError
    ------------------------------ Captured log call -------------------------------
    ERROR    ZODB.FileStorage:FileStorage.py:480 loading index
    UnicodeDecodeError: 'ascii' codec can't decode byte 0xb7 in position 25: ordinal not in range(128)

    The above exception was the direct cause of the following exception:

    Traceback (most recent call last):
      File "/home/kirr/src/wendelin/z/ZODB/src/ZODB/FileStorage/FileStorage.py", line 478, in _restore_index
        info = fsIndex.load(index_name)
      File "/home/kirr/src/wendelin/z/ZODB/src/ZODB/fsIndex.py", line 138, in load
        v = unpickler.load()
    SystemError: <built-in method read of _io.BufferedReader object at 0x7f7bb3df03b0> returned a result with an error set
    ERROR    ZODB.FileStorage:FileStorage.py:480 loading index
    UnicodeDecodeError: 'ascii' codec can't decode byte 0xb7 in position 25: ordinal not in range(128)

    ...

-> Fix it by preparing tidmin in the test a 8-bytes binary properly.

65ebbe7b

*: Fix working on py3 by using bstr bytestring instead of raw bytes · 9861c136

Kirill Smelkov authored Sep 07, 2022

e.g. for ObjectData .hashfunc:

In many contexts we need that .hashfunc to be like string, e.g. for
accessing hashRegistry by keys. In many other contexts - e.g. when
zodbdump input it parsed or emitted, it is more handy to handle it like
raw bytes.

If we let .hashfunc to be of type str - it breaks the second mode. If of
type bytes - it breaks the first mode.

And also in many places it is hard to constantly encode/decode str and
bytes, especially in the places where an object is sometimes used in
strings context, and sometimes in binary context.

-> Fix it all in one go by using bytestring type from pygolang,
which provides both unicode string and binary semantics simultaneously.

This needs bstr from pygolang (see pygolang@c9648c44),
but even if pygolang comes without bstr, with this patch zodbtools
continues to work ok on py2 - it will be just py3 mode that won't work.

The list of test failures before this patch is provided below:

    _______________________________ test_zodbanalyze _______________________________

    tmpdir = local('/tmp/pytest-of-kirr/pytest-22/test_zodbanalyze0')
    capsys = <_pytest.capture.CaptureFixture object at 0x7f3de6835c70>

        def test_zodbanalyze(tmpdir, capsys):
            tfs1 = fs1_testdata_py23(tmpdir,
                            os.path.join(os.path.dirname(__file__), "testdata", "1.fs"))

            for use_dbm in (False, True):
    >           report(
                    analyze(
                        tfs1,
                        use_dbm=use_dbm,
                        delta_fs=False,
                        tidmin=None,
                        tidmax=None,
                    ),
                    csv=False,
                )

    zodbtools/test/test_analyze.py:30:
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

    rep = <zodbtools.zodbanalyze.Report object at 0x7f3de5e16b20>, csv = False

        def report(rep, csv=False):
            ...
                    print (fmtp % (t_display, rep.TYPEMAP[t], rep.TYPESIZE[t],
                                   pct, rep.TYPESIZE[t] * 1.0 / rep.TYPEMAP[t],
    >                              rep.COIDSMAP[t], rep.CBYTESMAP[t],
                                   rep.FOIDSMAP.get(t, 0), rep.FBYTESMAP.get(t, 0)))
    E               KeyError: b'persistent.mapping.PersistentMapping'

    zodbtools/zodbanalyze.py:147: KeyError

    ____________________________ test_zodbcommit[!zext] ____________________________

    zext = <function zext.<locals>._ at 0x7f3deb5c3e50>

        @func
        def test_zodbcommit(zext):
            tmpd = mkdtemp('', 'zodbcommit.')
            defer(lambda: rmtree(tmpd))

            stor = storageFromURL('%s/2.fs' % tmpd)
            defer(stor.close)

            head = stor.lastTransaction()

            # commit some transactions via zodbcommit and verify if storage dump gives
            # what is expected.
            t1 = Transaction(z64, ' ', b'user name', b'description ...', zext(dumps({'a': 'b'}, _protocol)), [
                ObjectData(p64(1), b'data1', 'sha1', sha1(b'data1')),
                ObjectData(p64(2), b'data2', 'sha1', sha1(b'data2'))])

            t1.tid = zodbcommit(stor, head, t1)

            t2 = Transaction(z64, ' ', b'user2', b'desc2', b'', [
                ObjectDelete(p64(2))])

            t2.tid = zodbcommit(stor, t1.tid, t2)

            buf = BytesIO()
            zodbdump(stor, p64(u64(head)+1), None, out=buf)
            dumped = buf.getvalue()

    >       assert dumped == b''.join([_.zdump() for _ in (t1, t2)])

    zodbtools/test/test_commit.py:61:
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    zodbtools/test/test_commit.py:61: in <listcomp>
        assert dumped == b''.join([_.zdump() for _ in (t1, t2)])
    zodbtools/zodbdump.py:521: in zdump
        z += obj.zdump()
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

    self = <zodbtools.zodbdump.ObjectData object at 0x7f3de5d26d90>

        def zdump(self):
            data = self.data
            hashonly = isinstance(data, HashOnly)
            if hashonly:
                size = data.size
            else:
                size = len(data)
    >       z = b'obj %s %d %s:%s' % (ashex(self.oid), size, self.hashfunc, ashex(self.hash_))
    E       TypeError: %b requires a bytes-like object, or an object that implements __bytes__, not 'str'

    zodbtools/zodbdump.py:569: TypeError

    _______________________________ test_dumpreader ________________________________

        def test_dumpreader():
            in_ = b"""\
        txn 0123456789abcdef " "
        user "my name"
        description "o la-la..."
        extension "zzz123 def"
        obj 0000000000000001 delete
        obj 0000000000000002 from 0123456789abcdee
        obj 0000000000000003 54 adler32:01234567 -
        obj 0000000000000004 4 sha1:9865d483bc5a94f2e30056fc256ed3066af54d04
        ZZZZ
        obj 0000000000000005 9 crc32:52fdeac5
        ABC

        DEF!

        txn 0123456789abcdf0 " "
        user "author2"
        description "zzz"
        extension "qqq"

        """

            r = DumpReader(BytesIO(in_))
    >       t1 = r.readtxn()

    zodbtools/test/test_dump.py:78:
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    zodbtools/zodbdump.py:443: in readtxn
        self._badline('unknown hash function %s' % qq(hashfunc))
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

    self = <zodbtools.zodbdump.DumpReader object at 0x7f3de5d69cd0>
    msg = 'unknown hash function "adler32"'

        def _badline(self, msg):
    >       raise RuntimeError("%s+%d: invalid line: %s (%s)" % (_ioname(self._r), self.lineno, msg, qq(self._line)))
    E       RuntimeError: +7: invalid line: unknown hash function "adler32" ("obj 0000000000000003 54 adler32:01234567 -")

    zodbtools/zodbdump.py:382: RuntimeError

    ___________________________ test_zodbrestore[!zext] ____________________________

    tmpdir = local('/tmp/pytest-of-kirr/pytest-22/test_zodbrestore__zext_0')
    zext = <function zext.<locals>._ at 0x7f3de5d6ddc0>

        @func
        def test_zodbrestore(tmpdir, zext):
            zkind = '_!zext' if zext.disabled else ''

            # restore from testdata/1.zdump.ok and verify it gives result that is
            # bit-to-bit identical to testdata/1.fs
            tdata = dirname(__file__) + "/testdata"
            @func
            def _():
                zdump = open("%s/1%s.zdump.raw.ok" % (tdata, zkind), 'rb')
                defer(zdump.close)

                stor = storageFromURL('%s/2.fs' % tmpdir)
                defer(stor.close)

                zodbrestore(stor, zdump)
    >       _()

    zodbtools/test/test_restore.py:49:
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    ../../venv/py3.venv/lib/python3.9/site-packages/decorator.py:232: in fun
        return caller(func, *(extras + args), **kw)
    ../../../tools/go/pygolang/golang/__init__.py:103: in _
        return f(*argv, **kw)
    zodbtools/test/test_restore.py:48: in _
        zodbrestore(stor, zdump)
    zodbtools/zodbrestore.py:39: in zodbrestore
        txn = zr.readtxn()
    zodbtools/zodbdump.py:443: in readtxn
        self._badline('unknown hash function %s' % qq(hashfunc))
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

    self = <zodbtools.zodbdump.DumpReader object at 0x7f3de5d79e20>
    msg = 'unknown hash function "sha1"'

        def _badline(self, msg):
    >       raise RuntimeError("%s+%d: invalid line: %s (%s)" % (_ioname(self._r), self.lineno, msg, qq(self._line)))
    E       RuntimeError: /home/kirr/src/wendelin/z/zodbtools/zodbtools/test/testdata/1_!zext.zdump.raw.ok+5: invalid line: unknown hash function "sha1" ("obj 0000000000000000 61 sha1:664e6de0f153d8eaeda638d616a320c6e3c5feb1")

    zodbtools/zodbdump.py:382: RuntimeError

9861c136

zodbcommit: Fix stdin reading on py3 · b21fbe23

Kirill Smelkov authored Sep 07, 2022

Zodbcommit reads input in zodbdump format from stdin and then uses
zodbdump.DumpReader to parser that input. The parser works on binary
data.

However zodbcommit, was preparing that input data mixing bytes and
strings, which is failing on py3:

    (py3.venv) kirr@deca:~/src/wendelin/z/zodbtools$ zodb commit 1.fs 00
    Ignoring index for /home/kirr/src/wendelin/z/zodbtools/1.fs
    aaa
    Traceback (most recent call last):
      File "/home/kirr/src/wendelin/venv/py3.venv/bin/zodb", line 33, in <module>
        sys.exit(load_entry_point('zodbtools', 'console_scripts', 'zodb')())
      File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodb.py", line 129, in main
        return command_module.main(argv)
      File "/home/kirr/src/wendelin/venv/py3.venv/lib/python3.9/site-packages/decorator.py", line 232, in fun
        return caller(func, *(extras + args), **kw)
      File "/home/kirr/src/tools/go/pygolang/golang/__init__.py", line 103, in _
        return f(*argv, **kw)
      File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodbcommit.py", line 222, in main
        zin += sys.stdin.read()
    TypeError: can't concat str to bytes

-> Fix it by reading stdin in binary mode.

No test currently as zodbcommit.main is not covered by tests (hopefully yet).

b21fbe23

zodbdump: Fix pickle disassembly on py3 · 69dc6de1

Kirill Smelkov authored Sep 07, 2022

pickletools.dis, which is used to handle --pretty=zpickledis (*),
expects output stream be text-like, not binary. We were passing a binary
stream to it. As the result pickle disassembly was failing on py3:

    _______________________ test_zodbdump[!zext-zpickledis] ________________________

    tmpdir = local('/tmp/pytest-of-kirr/pytest-11/test_zodbdump__zext_zpickledis0')
    zext = <function zext.<locals>._ at 0x7f538b508670>, pretty = 'zpickledis'

        @mark.parametrize('pretty', ('raw', 'zpickledis'))
        def test_zodbdump(tmpdir, zext, pretty):
            tdir  = dirname(__file__)
            zkind = '_!zext' if zext.disabled else ''
            tfs1  = fs1_testdata_py23(tmpdir, '%s/testdata/1%s.fs' % (tdir, zkind))
            stor  = FileStorage(tfs1, read_only=True)

            with open('%s/testdata/1%s.zdump.%s.ok' % (tdir, zkind, pretty), 'rb') as f:
                dumpok = f.read()

            out = BytesIO()
    >       zodbdump(stor, None, None, pretty=pretty, out=out)

    zodbtools/test/test_dump.py:48:
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    zodbtools/zodbdump.py:165: in zodbdump
        pickletools.dis(dataf, disf) # class
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

    pickle = <_io.BytesIO object at 0x7f538b577130>
    out = <_io.BytesIO object at 0x7f538b49f8b0>, memo = {}, indentlevel = 4
    annotate = 0

        def dis(pickle, out=None, memo=None, indentlevel=4, annotate=0):
            """Produce a symbolic disassembly of a pickle..."""
            ...
            for opcode, arg, pos in genops(pickle):
                if pos is not None:
    >               print("%5d:" % pos, end=' ', file=out)
    E               TypeError: a bytes-like object is required, not 'str'

    /usr/lib/python3.9/pickletools.py:2450: TypeError

-> Fix it by letting pickletools.dis to emit its output to StringIO instead of BytesIO.

(*) see 80559a94 "zodbdump: support --pretty option with a format to show
    pickles disassembly"

69dc6de1

tests: Adjust testdata FileStorage for current Python on the fly · e825f80f

Kirill Smelkov authored Sep 07, 2022

FileStorage/py2 uses `FS21` magic in file header, whereas
FileStorage/py3 uses `FS30` magic:

    https://github.com/zopefoundation/ZODB/blob/0e72b8b13657/src/ZODB/_compat.py#L39
    https://github.com/zopefoundation/ZODB/blob/0e72b8b13657/src/ZODB/_compat.py#L74

And if, upon opening the database, file magic does not match to what ZODB
expects, open is rejected:

    https://github.com/zopefoundation/ZODB/blob/0e72b8b13657/src/ZODB/FileStorage/FileStorage.py#L88
    https://github.com/zopefoundation/ZODB/blob/0e72b8b13657/src/ZODB/FileStorage/FileStorage.py#L1625-L1630

This is done with the idea for a database, that was written from
Python2, to be rejected to be opened from Python3 and vice-versa because
strings/bytes semantics changed in between py23.

As the result, many zodbtools tests currently fail on py3 when they try
to access prepared FileStorage database in testdata, because that
database was originally prepared on py2. Here is, for example, how
test_zodbdump fails:

    ___________________________ test_zodbdump[zext-raw] ____________________________

    zext = <function zext.<locals>._ at 0x7f28530bf9d0>, pretty = 'raw'

        @mark.parametrize('pretty', ('raw', 'zpickledis'))
        def test_zodbdump(zext, pretty):
            tdir  = dirname(__file__)
            zkind = '_!zext' if zext.disabled else ''
    >       stor  = FileStorage('%s/testdata/1%s.fs' % (tdir, zkind), read_only=True)

    zodbtools/test/test_dump.py:41:
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    ../ZODB/src/ZODB/FileStorage/FileStorage.py:315: in __init__
        self._pos, self._oid, tid = read_index(
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

    file = <_io.BufferedReader name='/home/kirr/src/wendelin/z/zodbtools/zodbtools/test/testdata/1.fs'>
    name = '/home/kirr/src/wendelin/z/zodbtools/zodbtools/test/testdata/1.fs'
    index = <ZODB.fsIndex.fsIndex object at 0x7f2852fee2b0>, tindex = {}
    stop = b'\xff\xff\xff\xff\xff\xff\xff\xff'
    ltid = b'\x00\x00\x00\x00\x00\x00\x00\x00', start = 4
    maxoid = b'\x00\x00\x00\x00\x00\x00\x00\x00', recover = 0, read_only = True

        def read_index(file, name, index, tindex, stop=b'\377'*8,
                       ltid=z64, start=4, maxoid=z64, recover=0, read_only=0):
            """Scan the file storage and update the index."""
            ...
            if file_size:
                if file_size < start:
                    raise FileStorageFormatError(file.name)
                seek(0)
                if read(4) != packed_version:
    >               raise FileStorageFormatError(name)
    E               ZODB.FileStorage.FileStorage.FileStorageFormatError: /home/kirr/src/wendelin/z/zodbtools/zodbtools/test/testdata/1.fs

    ../ZODB/src/ZODB/FileStorage/FileStorage.py:1630: FileStorageFormatError

Since zodbtools primarily work on raw data without decoding stored
pickles, unlike Zope or ERP5, it should not be a problem for zodbtools
to work on py3 with the database that was prepared on py2.

-> Adjust all tests to use FileStorage data generated on the fly based
on original files in testdata/ but with FileStorage header being
rewritten to match current python.

e825f80f

util += writefile · 3cb93096

Kirill Smelkov authored Sep 07, 2022

A counterpart to readfile - to write a file instead of reading it.
We will need this function in the next patch.

3cb93096

util: Factor readfile function into here · adec18bd
Kirill Smelkov authored Sep 07, 2022
```
Soon we will need to use it not only from test_restore.py
```
adec18bd

29 Mar, 2022 1 commit

zodbdump: support --pretty option with a format to show pickles disassembly · 80559a94

Jérome Perrin authored Mar 20, 2022

Showing pickle disassembly can sometimes be useful to analyse details of
the pickle content. We realized that in some data structures used in
ERP5 the same string was saved multiple times in the same pickle and by
using the exact same string (ie. for which `s1 is s2` is True), the
pickle will have the string only once and pickles are a bit smaller. For
more reference, the context was
erp5!1560 (comment 154825)

This introduces a new --pretty option that we will be able to extend
later with more output formats.
Co-authored-by: Kirill Smelkov <kirr@nexedi.com>
Reviewed-on: !22

80559a94

01 Apr, 2021 1 commit

zodbrestore: Mark restore-with-extension tests as xfail on ZODB4 · aa7e1966

Jérome Perrin authored Mar 18, 2021

@kirr wrote (nexedi/zodbtools!19 (comment 129442))

For the reference - contrary to ZODB5, restore tests on ZODB4 are currently
[broken](https://nexedijs.erp5.net/#/test_result_module/20210317-B3AC205A/2).
Restored file is not bit-to-bit identical to the original.

The problem is that on commit/restore, we need to save
user/description/extension. For extension `zodbdump.Transaction` provides
.extension_bytes, which ZODB5 uses to save its raw copy. However ZODB4 goes
through `.extension` and pickles it:

https://lab.nexedi.com/nexedi/zodbtools/blob/129afa67/zodbtools/zodbdump.py#L425-453
https://github.com/zopefoundation/ZODB/blob/4/src/ZODB/BaseStorage.py#L220-L240

This leads to unpickle-repickle round-trip and different extension being committed on restore:

```diff
diff --git a/1zdump b/2zdump
index 5033bc1..a3a32aa 100644
--- a/1zdump
+++ b/2zdump
@@ -10,7 +10,7 @@ q^A.
txn 0285cbac3d0369e6 " "
user "user0.0"
description "step 0.0"
-extension "\x80\x02}q\x01(U\tx-cookieSU\x05RF9IEU\vx-generatorq\x02U\fzodb/py2 (f)u."
+extension "}q\x01(U\tx-cookieSU\x05RF9IEU\vx-generatorU\fzodb/py2 (f)u."
obj 0000000000000000 98 sha1:eba252d1984f975ecb636bc1b3a89c953dd20527
...
```

What might save us is to somehow in Transaction.extension returns a
dict-subclass object that is somehow pickled to the exact bytes remembered when
it was created. However, after briefly checking, I could not find a mechanism
to do so yet...

@jerome wrote (nexedi/zodbtools!19 (comment 129479))

@kirr we already have pytest fixtures to test differently depending on whether
the ZODB version has support for extension_bytes, so what about using it in the
test and testing restoring the extension bytes version of the dump only for
ZODB5 ?

@kirr wrote (nexedi/zodbtools!19 (comment 129482))

@jerome, yes we have this, but I believe we should actually fix zodbrestore to
be reliable whatever ZODB is used. For ZODB5 it works. For ZODB4-wc2 we can
adjust ZODB code to use extension_bytes similarly to how ZODB5 does. But
unpatched ZODB4 is currently out of luck. As it was decided that Nexedi will
use both ZODB4 and ZODB4-wc2, I think we should fix zodbrestore to work on all
those versions to be reliable.

/cc @tomo

@kirr:

-> No universal ZODB4 fix for now (this would require to monkey patch ZODB in
several places), so mark "restore with extension" test as xfail similarly to
how we already do for "dump with extension" test.

This brings -ZODB4 and -ZODB4-wc2 tests back to PASS state.

Even though on ZODB4 extension is restored not bit-to-bit exactly, it is
restored to be the same dictionary equal to what was used to produce the
dump. Not ideal, but still not loosing the information in practice.

One more reason to switch to ZODB5...

aa7e1966

16 Mar, 2021 2 commits

zodbcommit: Provide full context when reporting errors · 129afa67

Kirill Smelkov authored Mar 16, 2021

In the previous patch we taught object copy handler to report more
details, but it was still incomplete - the error was missing details
about which operation was run - commit, or restore of particular
transaction.

Noting that it can be also noted that other errors reported from that
function lack such context.

-> So fix it universally, at least for zodbcommit for now: set top-level
runctx to topic of what we are doing, and use that runctx when
generating errors. Runctx describes what we are running, and could be
also later used for logging and tracing. That's why it is called runctx
instead of just errctx for "error context".

TODO currently it is only exceptions that we explicitly raise which get
the context. If an exception is raised by something that we call - the
context won't be added. It would be good to later rework error handling
and append such context for any raised error. Defer and
https://lab.nexedi.com/kirr/go123/blob/863c4602/xerr/__init__.py has
something preliminary for this.

The particular error when restoring a missing object copy becomes

    ValueError: /tmp/demo002868462/δ0285cbac75555580/δ.fs: restore 0285cbacb70a3db3 @0285cbacb258bf66: object 0000000000000003: copy from @0285cbac70a3d733: no data

instead of older

    ValueError: /tmp/demo358030847/δ0285cbac75555580/δ.fs: object 0000000000000003: copy from @0285cbac70a3d733: no data

/reviewed-by @jerome
/reviewed-on nexedi/zodbtools!20

129afa67

zodbcommit: Robustify copy handling · fa00c283

Kirill Smelkov authored Mar 16, 2021

When zodbdump input says to copy an object, we first load that object.
However if object does not exist loadBefore raises POSKeyError, and when
object at copied-from revision was deleted loadBefore returns None.

-> Handle that explicitly to provide failure details to the user, so
that instead of cryptic

    === RUN   TestLoad/δstart=0285cbac75555580
    Traceback (most recent call last):
      File "/usr/lib/python2.7/runpy.py", line 174, in _run_module_as_main
        "__main__", fname, loader, pkg_name)
      File "/usr/lib/python2.7/runpy.py", line 72, in _run_code
        exec code in run_globals
      File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodb.py", line 133, in <module>
        main()
      File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodb.py", line 129, in main
        return command_module.main(argv)
      File "<decorator-gen-6>", line 2, in main
      File "/home/kirr/src/tools/go/pygolang/golang/__init__.py", line 103, in _
        return f(*argv, **kw)
      File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodbrestore.py", line 94, in main
        zodbrestore(stor, asbinstream(sys.stdin), _)
      File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodbrestore.py", line 43, in zodbrestore
        zodbcommit(stor, at, txn)
      File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodbcommit.py", line 122, in zodbcommit
        _()
      File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodbcommit.py", line 91, in _
        data, _, _ = stor.loadBefore(obj.oid, p64(u64(obj.copy_from)+1))
    TypeError: 'NoneType' object is not iterable
        xtesting.go:483: /tmp/demo009767458/δ0285cbac75555580/δ.fs: zpyrestore: exit status 1

it fails with something more understandable:

    === RUN   TestLoad/δstart=0285cbac75555580
    Traceback (most recent call last):
      File "/usr/lib/python2.7/runpy.py", line 174, in _run_module_as_main
        "__main__", fname, loader, pkg_name)
      File "/usr/lib/python2.7/runpy.py", line 72, in _run_code
        exec code in run_globals
      File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodb.py", line 133, in <module>
        main()
      File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodb.py", line 129, in main
        return command_module.main(argv)
      File "<decorator-gen-6>", line 2, in main
      File "/home/kirr/src/tools/go/pygolang/golang/__init__.py", line 103, in _
        return f(*argv, **kw)
      File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodbrestore.py", line 94, in main
        zodbrestore(stor, asbinstream(sys.stdin), _)
      File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodbrestore.py", line 43, in zodbrestore
        zodbcommit(stor, at, txn)
      File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodbcommit.py", line 129, in zodbcommit
        _()
      File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodbcommit.py", line 97, in _
        (stor.getName(), ashex(obj.oid), ashex(obj.copy_from)))
    ValueError: /tmp/demo358030847/δ0285cbac75555580/δ.fs: object 0000000000000003: copy from @0285cbac70a3d733: no data
        xtesting.go:483: /tmp/demo358030847/δ0285cbac75555580/δ.fs: zpyrestore: exit status 1

For the implementation it would be easier to use loadAt
(https://github.com/zopefoundation/ZODB/pull/323), but we don't have
that yet.

/reviewed-by @jerome
/reviewed-on !20

fa00c283

15 Mar, 2021 2 commits

restore, commit: Help += note that those tools are low-level · 4275f2e9

Kirill Smelkov authored Mar 15, 2021

Suggessted by @jerome here: !19 (comment 129181)

Co-authored-with: Jérome Perrin <jerome@nexedi.com>
/reviewed-on !19

4275f2e9

zodbrestore - Tool to restore content of a ZODB database from zodbdump output · b944e0ee

Kirill Smelkov authored Mar 10, 2021

Zodbrestore is long-coming counterpart to zodbdump.
Implementation is internally based on reworked zodbcommit.

For FileStorage restored database is verified via test to be bit-to-bit
identical to the original.

For NEO it won't be exactly the case, as NEO does not implement
IStorageRestoreable: there is only tpc_begin(tid=...) but no restore().

/helped-by @jerome
/reviewed-on nexedi/zodbtools!19

b944e0ee