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Otherwise, None ends up being put in object cache, which fails.

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This fixes random failures in old ZODB undo tests, where tpc_vote was not
called before tpc_finish/tpc_abort.

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This makes it possible to implement an undo on client side, as a flaw has
been found in it when used in parallel with replication.

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This was intended to be a raise, but was broken. Anyway, it's not
required for not-committed-yet pack implementation.

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tm.storeObject is not supposed to return a callable.

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Credit: Leonardo Rochael Almeida
Indentation of setup.py by me.


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This prepares NEO's initial eggification.
Credit: Leonardo Rochael Almeida


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Record is expected to contain the TID of previous transaction which
modified given object. This is not the meaning of 3rd value returned by
_load (the TID of the next transaction modifying object).
So, instead, cache the last TID of each object, until there is no next
transaction modifying them.*
As this can become a memory problem with big number of objects, add a TODO.

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Also, make HandlerSwitcher.isPending() return a boolean, to avoid leaking
instance content to foreign code.

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There are 2 possibilities when an object is not found:
- the object doesn't exist at all
- the object exists, but nothing matches serial criterion

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r2242 removed the case where we wouldn't be abdle to access the last
version of an object with loadBefore, and its test code is reused here to
check the "not visible" case.
r2250 modified the response in case where an internal error occured.

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Also, fix _load error message, as only data inconsistency can lead to -1
error code now (and it is set locally).

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