[issue36144] Dictionary union. (PEP 584)

[Brandt Bucher]

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

Yes, I can add a section explaining that after the PEP was accepted, we decided to add the operators to several non-dict mappings as well. I'm also going to add some explanation as to why Mapping/MutableMapping didn't grow them, too.

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