[issue11455] issue a warning when populating a CPython type dict with non-string keys

[Daniel Urban]

Daniel Urban <urban.dani+py at gmail.com> added the comment:

> I would prefer an explicit PyExc_RuntimeWarning to not have to read the
> source of PyErr_WarnFormat() or its documentation.

The patch at issue11470 adds a new warning type, CompatibilityWarning. I think probably that should be used here too.

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