[issue17810] Implement PEP 3154 (pickle protocol 4)

[Nick Coghlan]

Nick Coghlan added the comment:

Potentially relevant to this: we hope to have PEP 451 done for 3.4, which adds a __spec__ attribute to module objects, and will also tweak runpy to ensure -m registers __main__ under it's real name as well.

If pickle uses __spec__.name in preference to __name__ when __spec__ is defined, then objects defined in __main__ modules run via -m should start being pickled correctly.

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nosy: +ncoghlan

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