[Python-ideas] Add MutableSet.update?

[Lucas Wiman]

I was trying to use `collections.abc.MutableSet` today, and noticed that it
does not define an `update` method. This is a very useful method that is
present on the builtin `set` class, and seems to fit naturally with the
other methods.

Was omitting this method intentional?

Thanks & best wishes,
Lucas Wiman
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