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

[Jeroen Demeyer]

Jeroen Demeyer <J.Demeyer at UGent.be> added the comment:

See also PEP 590, which has very similar ideas. Also PEP 580 is related to this.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue29259>
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