[issue46376] PyMapping_Check returns 1 for list

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

collections.abc.Mapping is fixed by https://bugs.python.org/issue43977
We can be same thing if backward compatibility allows it.

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nosy: +methane

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<https://bugs.python.org/issue46376>
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