SSH command size: 439 (+4 bytes)
Preamble size: 8941 (no change)

This _increases_ the size of the first stage, but
- Eliminates one of the two remaining uses of `sys`
- Reads the preamble as a byte-string, no call `.encode()`
   is needed on Python 3 before calling `_()`

SSH command size: 435 (-4 bytes)
Preamble size: 8962 (no change)

os.execl is the same as os.execv, but it take a variable number of
arguments instead of a single sequence.

SSH command size: 439 (-4 bytes)
Preamble size: 8962 (no change)

SSH command size: 443 (-5 bytes)
Preamble size: 8962

SSH command size: 448 (-5 bytes)
Preamble size: 8941 (no change)

NB: The 'zip' alias was absent in Python 3.x, until Python 3.4. This
should change be reverted if Python 3.0, 3.2, or 3.3 support is
required.

SSH command size: 453 (no change)
Preamble size: 8941 (-5 bytes)

SSH command size: 453 (-8 bytes)
Preamble size: 8946 (no change)

SSH command size: 461 (-8 bytes)
Preamble size: 8946 (no change)

Since python has reached the last statement this should occur anyway.

SSH command size: 469 (-11 bytes)
Preamble size: 8946 (no change)

Although the source is longer, the _compressed_ length is reduced.

SSH command size: 481 (down 1)
Preamble size: 8946 (no change)

SSH command size: 482 bytes (no change)
Preamble size: 8946 bytes (down 33)

Not strictly a rival, but has enough commonalities to be worth noting

All outgoing links checked with

```bash
cd docs
make linkcheck
```

```bash
cd docs
make
```

to run a webserver that automatically rerenders whenever the rST is
modified.

A first small mea culpa to all my testing sins of late :)

This actually addresses multiple problems:

* Single-file programs were broken, since the fix introduced in
  6931cc10c4a1e08161a58cf4b6b555b71cdc62b5 caused builtin_find_module()
  to start indicating __main__ can always be loaded locally. That's
  broken, and there might be more cases where the same problem will crop
  up.

  Since it was indicated __main__ could be loaded locally, the built-in
  import machinery was allowed to attempt that (since we remove __main__
  from sys.modules during bootstrap), which caused a safety check to
  fire in the bowels of Python:

      "Cannot re-init internal module %.200s"

* The check for presence of the whitelist was totally broken, since the
  whitelist is never an empty list. Therefore 'self' was being returned
  for every module, including extension modules like 'termios'.

I have hand-verified this does not break the fix for issue #113. I
looked at writing a test for that, but it requires a Docker container
(or similar) with an ancient version of Ansible installed. Will open a
separate ticket tracking this.

Mega broken.

This reverts commit a7dbbd96aaa5d1ff76c89f1826d3019905487797.

It's ignored by newer SSHes, which only pay attention to Compression.

Don't rely on maintaining a list of test files, it's too easy to forget
one and silently fail to run it.

Probably best to avoid angering the 800 lb gorilla with access to killer
robots.

https://example.org works, this is why it exists.

Excluded: graphml XML namespaces, links to e.g. Fabric homepage

Fixes #128

Trying to diagnose a Reddit user's problem.

Need a better story (perhaps a callback function?) for handling this.