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I see another memory allocation family here: What function
should objects allocated through PyType_GenericAlloc be
released with?

If you change the behaviour of PyType_GenericAlloc, all
types in extensions written for 2.2 that use
PyType_GenericAlloc will break, since they will still have
PyObject_Del in their tp_free slot.

I believe "families" should always be complete, so along
with PyType_GenericAlloc goes PyType_GenericFree.

If you want it fully backwards compatible, you need to
introduce PyType_PyMallocAlloc...