[issue42747] Remove Py_TPFLAGS_HAVE_VERSION_TAG flag?

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

Serhiy Storchaka:
> I don't think that it was right thing to break binary compatibility. It virtually buried the stable ABI.

IMO there is a misunderstanding about the stable ABI. PyType_FromSpec() doesn't need Py_TPFLAGS_HAVE_xxx flags: this function allocates a heap type which *has* all these members (set to 0/NULL by default).

And it's not possible to define a static type using the limited C API, since the PyTypeObject structure is excluded from it on purpose.

See bpo-32388 for a similar discussion.

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