[issue29259] Add tp_fastcall to PyTypeObject: support FASTCALL calling convention for all callable objects

Tue Jul 31 05:36:09 EDT 2018

Jeroen Demeyer <J.Demeyer at 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.

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nosy: +jdemeyer

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