Dennis Sweeney <sweeney.dennis...@gmail.com> added the comment:

This attempts to avoid the dispatch dance of

Py_DECREF(op) :: Py_TYPE(op)->tp_dealloc(op) :: Py_TYPE(op)->tp_free((PyObject 
*)op);

I suspect this earns the most speedup from floats, where freelist manipulation 
can be inlined. This might make a single-digit-int freelist more impactful.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46509>
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