Dennis Sweeney <sweeney.dennis...@gmail.com> added the comment:

I think this will also require typing.MappingProxyType to change a bit, since 
it would make a proxy's underlying dict accessible:

    >>> d = dict()
    >>> proxy = MappingProxyType(d)
    >>> type(proxy.items()) is type(d.items())  # should be False
    True
    >>> proxy.items().mapping is d  # should be False
    ???

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40890>
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