[issue46323] Use _PyObject_Vectorcall in Modules/_ctypes/callbacks.c

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

A benchmark on calling C functions using ctypes sounds better than a benchmark calling Python functions. For Python functions, Python objects are converted to C types, and then C types are convered back to Python objects, the Python result is converted to a C type, and then the C type is converted back to a Python object for the final result...

It would be nice to have a benchmark on different number of arguments. Like: 0, 1, 3, 5, 8, 10.

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