[issue16543] Use "positional arguments" in PyArg_UnpackTuple

[Ezio Melotti]

Ezio Melotti added the comment:

> Okay, but what exactly is this fixing? 

If the function parses positional args, it should say so in the error message.  If the function is never used (except for min/max) or if the error is never reported, then we have a different problem.

Even if this code is not used I don't think we can remove it, since this it's a public function, and even if we are not using it someone might be using it and benefit from the improved error message.

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