Currently the dictionary view objects behave exactly like sets when set
operations defined on them are used, such as the pipe or ampersand operators:
>>> d.keys() | [1]
{1, 2}
dictionary views are even sets by the ABC standard, having support for all the
required abstract methods:
>>> isinstance(d.keys(), collections.abc.Set)
True
However, the dict views do not have the equivalent named set methods, such as
`intersection` or `issuperset`. It seems that the collections.abc.Set API was
purposely crafted for returning True when a dict view is given as an argument
to isinstance, as c urrently, the `isdisjoint` method is the only named method
that the API requires.
I propose that the `Set` ABC API should be augmented to contain all of the
named methods. This would provide consistency in the collections, and enhance
the duck typing capabilities of the `Set` abc.
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