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

> I understand that tp_vectorcall_offset=0 is fine and the expected value for a 
> type which doesn't have the flag _Py_TPFLAGS_HAVE_VECTORCALL.

Not necessarily. There are subtleties involved when subclassing: there are 
cases where tp_vectorcall_offset needs to be non-zero despite 
_Py_TPFLAGS_HAVE_VECTORCALL not being set. See also PR 13858.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue37250>
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