[issue36144] Dictionary union. (PEP 584)

[Guido van Rossum]

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

I definitely think we should leave Shelf alone, it's a toy class from a different era.

It makes sense to update the weak dicts; hopefully the | and |= operators can be implemented in terms of other, more primitive operations, so we will have assurance that these classes' essential behavior is preserved.

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