[issue36974] Implement PEP 590

[Jeroen Demeyer]

Jeroen Demeyer <jeroen.k.demeyer at gmail.com> added the comment:

> Should we add a note like "if you get a 'SystemError: bad call flags' on import, check the descriptor flags of your functions" in What's New in Python 3.8?

A better solution would be to change the error message. We could change it to something like SystemError("bad flags 0x2 for PyCOMPS_categories_match")

But maybe it's not worth it. Are there many projects that define functions/methods but never call them?

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