[issue40890] Dict views should be introspectable

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

I meant that you can make dict_view.mapping always returning a MappingProxyType.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40890>
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