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> If there are no such cases I think we should fix it.
Okay, but what exactly is this fixing? I can't find any examples apart from max and min where the new error messages seem any better than the old. Your first message talks about "a function that receives both positional and keyword arguments", by which I guess you mean 'both required and optional arguments'; in any case, I can't find any such function (apart from max and min) that uses PyArg_ParseTuple. So it seems to me that there's not actually any problem to be solved.
(And I think max and min probably need to be reworked to not use PyArg_ParseTuple at all.)