[issue17960] Clarify the required behaviour of locals()

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

Nathaniel raised a valid concern about the draft PEP over in https://bugs.python.org/issue30744#msg302475, so I've been considering whether or not it would be possible to make the write-through proxy idea work without introducing other problems.

I think I have a workable design concept for that approach now: https://bugs.python.org/issue30744#msg304099

So the next step will be to see if that actually does work as well as I think it will, and if so, update the PEP accordingly.

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nosy: +njs

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