[issue20260] Argument Clinic: add unsigned integers converters

[Stefan Krah]

Stefan Krah added the comment:

I think we cannot change PyLong_AsUnsignedLong() without a deprecation period,
if at all.  That leaves the option of changing the converters.

My preference is to raise either OverflowError or ValueError for *both*
out-of-range conditions.

People may me used to OverflowError by now -- the usage in PyLong_AsUnsignedLong()
dates back to very early revisions -- but there are equally good reasons to use
ValueError.

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