Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

With option 4 we need to add a custom wrapper not only for Shelf's KeysView, 
but for KeysView of all similar proxy classes, including classes in third-party 
code not available for us. This is impossible.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32300>
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