[issue43838] There is a way to access an underlying mapping in MappingProxyType

[Serhiy Storchaka]

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

For __or__ we need to copy the content of both mapping to the resulting mapping in any case. We can implement it as {**self, **other}. We should not use the copy() method because it is not a part of the Mapping interface.

For __eq__, no copying is needed if we just re-implement Mapping.__eq__ (with special cases for few known types for performance).

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<https://bugs.python.org/issue43838>
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