[issue36144] Dictionary union. (PEP 584)

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

I didn't see your second reply, with `ChainMap(other, *cm.maps)`.

I'm not so keen on that, because its special behavior can't be mimicked by `|=`.

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