Brandt Bucher <[email protected]> added the comment:
Any class that registers itself as a Mapping/MutableMapping using their
"register" methods (*not* through inheritance) will be lacking the new methods.
This includes all C extensions.
Further, binary "|" would require subclasses of these ABCs to have a concrete
way of creating a new instance (we don't have anything like Set._from_iterable
for this). One option could be to just call self.__class__({**self, **other}),
but a cursory scan of the stdlib shows that many classes don't have compatible
signatures, and the we would get lots of surprising/broken behavior if we just
suddenly introduced this.
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<https://bugs.python.org/issue43085>
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