[issue36144] Dictionary union. (PEP 584)

[Brandt Bucher]

Brandt Bucher <brandtbucher at gmail.com> added the comment:

Three other MutableMappings we might want to update:

- shelve.Shelf
- weakref.WeakKeyDictionary
- weakref.WeakValueDictionary

Shelf is up in the air, since it doesn't look like it defines a copy() equivalent... I also have no experience with it. Since it's a MutableMapping subclass, (not a dict subclass), we could in theory hold off on updating this until someone asks for it, without backward compatibility issues.

I think the other two should be updated, though. I can coordinate PRs for them this week.

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<https://bugs.python.org/issue36144>
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