[issue23401] Add pickle support of Mapping views

[Raymond Hettinger]

Raymond Hettinger added the comment:

> Raymond, what is your opinion?

Whether and how to pickle should be at the discretion of a concrete class rather than a requirement for being a mapping.  For example, it may not make any sense for a persistent dictionary such as a FileDict or an SQLDict.  Also, my mental model of a mapping view is something that is transparent, a window to the world rather than the world itself.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23401>
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