[issue23264] Add pickle support of dict views

[Guido van Rossum]

Guido van Rossum added the comment:

On general I think we should always document whether a class is picklable.
And we should document how a subclass can hook into pickling.

--Guido (mobile)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23264>
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