[docs] [issue37145] collections.abc.MappingView mixins rely on undocumented _mapping

[Geoffrey Sneddon]

Geoffrey Sneddon <geoffers+pythonbugs at gmail.com> added the comment:

Like, where in the documentation can I learn that MappingView's initializer takes an argument "mapping"?

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<https://bugs.python.org/issue37145>
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