[issue33408] Enable AF_UNIX support in Windows

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:

Most of those examples would break today if run on Windows, though (AttributeError). So they'd just continue to break, probably with a different error (I'm not clear what happens if we specify SOCK_DGRAM with this change).

Having an undocumented field doesn't really help much - what we want is a documented field with a different name, perhaps WIN_AF_UNIX? (I think we need to keep the "AF_" prefix for real values and not mess up the namespace ourselves.) That way we can document that it matches AF_UNIX when defined on Windows, but will not trigger existing code that checks for the presence of AF_UNIX. Then we'll have to update the standard library to use either/both values where supported.

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<https://bugs.python.org/issue33408>
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