Jeroen Demeyer <j.deme...@ugent.be> added the comment:

> For compatibility with extensions built with older Pythons you should define 
> new type flag and read tp_fastcall only if the flag is set.

Can you comment on https://github.com/python/cpython/pull/4944 why you think 
that such compatibility should be guaranteed? According to PEP 384, the layout 
of PyTypeObject is not part of the stable ABI.

----------
nosy: +jdemeyer

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