Hello,
I have one implementation question about vectorcall which is not
specified in PEP 590: what should happen if a type implements vectorcall
(i.e. _Py_TPFLAGS_HAVE_VECTORCALL is set) but doesn't set tp_call (i.e.
tp_call == NULL)? I see the following possibilities:
1. Ignore this problem/assume that it won't happen. This would be bad,
since callable(obj) would be False even though obj() would succeed.
2. Raise SystemError.
3. Automatically set tp_call to PyVectorcall_Call.
I would vote for 3 since it's the most user-friendly option. There is
also no way how it could be wrong: it ensures that tp_call and
vectorcall are consistent.
Any opinions?
Jeroen.
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