[issue43795] Implement PEP 652 -- Maintaining the Stable ABI

[Petr Viktorin]

Petr Viktorin <encukou at gmail.com> added the comment:

I opened https://bugs.python.org/issue44116 for the leak when trying to unload _csv.
Looks like investigating that will take a while, so I'll send a small PR to unblock the buildbots.

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