Message 345347 - Python tracker

➜

This issue tracker has been migrated to GitHub, and is currently read-only.
For more information, see the GitHub FAQs in the Python's Developer Guide.

Content 
> 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.