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Sat Apr 27 08:27:53 EDT 2019 · https://mail.python.org/pipermail/python-dev/2019-April/157229.html

On 2019-04-27 14:07, Mark Shannon wrote:
> class D(C):
>      __call__(self, ...):
>          ...
>
> and then create an instance `d = D()` then calling d will have two
> contradictory behaviours; the one installed by C in the function pointer
> and the one specified by D.__call__

It's true that the function pointer in D will be wrong but it's also 
irrelevant since the function pointer won't be used: class D won't have 
the flag Py_TPFLAGS_HAVE_CCALL/Py_TPFLAGS_HAVE_VECTORCALL set.

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[Python-Dev] PEP 580/590 discussion