[issue20440] Use Py_REPLACE/Py_XREPLACE macros

[Tal Einat]

Tal Einat added the comment:

While we're bikeshedding, how about the more verbose PY_DECREF_AND_ASSIGN? That makes it clearer that an INCREF is not done.

Regarding Kristján's suggestion of PY_ASSIGN and a complementary PY_STORE, IMO these names are too similar and the difference between them is not clear.

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nosy: +taleinat

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