[issue28280] Always return a list from PyMapping_Keys/PyMapping_Values/PyMapping_Items

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

PySequence_List() is the simplest way in C. I don't know whether we need special error messages now. But for compatibility keep them.

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<https://bugs.python.org/issue28280>
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