Hello,
I have a simple question for which there doesn't seem to be a good
answer: is the layout of PyTypeObject considered to be part of the
stable ABI?
Officially, the answer is certainly "no" (see PEP 384).
However, unofficially the answer might be "yes". At least, the last time
that an incompatible change was made to PyTypeObject (adding tp_finalize
in Python 3.4, PEP 442), care was taken not to break the ABI by using
the Py_TPFLAGS_HAVE_FINALIZE flag.
There is some discussion about this on https://bugs.python.org/issue32388
The implementation of PEP 590 is going to make another ABI-breaking
change. So should we add a new Py_TFLAGS_HAVE_... flag for that or not?
Jeroen.
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