[issue46433] _PyType_GetModuleByDef optimization is incorrect

[Petr Viktorin]

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

Just 3.10, after all. 3.9 doesn't have the function yet.

I did the backport, but I'd welcome a review by a fresh set of eyes!

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versions:  -Python 3.9

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