[issue42410] Raise a pickleError when convert _functools module to use PyType_FromModuleAndSpec

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> _pickle.PicklingError: Can't pickle <class 'functools.partial'>: it's not the same object as functools.partial

I don't understand this error. It looks like a bug in functools.

The PR 23407 looks like a workaround rather than a fix.

You should analyze why "cls != obj" conditon is true: why cls is not obj?

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