[docs] [issue23020] New matmul operator crashes modules compiled with CPython3.4

[Antoine Pitrou]

Antoine Pitrou added the comment:

There was probably an informal "best effort ABI compatibility" in 2.x that we de facto dropped in 3.x. Otherwise, as Amaury points out, several Py_TPFLAGS_HAVE_XXX flags would have no purpose.

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nosy: +pitrou

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23020>
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