[issue39611] PyVectorcall_NARGS(): change return type to Py_ssize_t

[STINNER Victor]

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

Alright, I was confused by how PyVectorcall_NARGS() is supposed to be used.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39611>
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