[issue19702] Update pickle to PEP 451

[Eric Snow]

New submission from Eric Snow:

I don't recall the specifics of how we'd talked about making use of module specs in pickle.  I vaguely remember (or misremember <wink>) something related to saving __main__.__spec__.name in the pickle rather than __main__.__name__.  Anyone have anything more concrete than that?  I'm willing to work this out but only with a more specific goal relative to the pickle module.

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nosy: +alexandre.vassalotti, pitrou
stage: test needed -> needs patch
type:  -> enhancement

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