STINNER Victor <vstin...@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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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42747>
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