Akuli <akuviljane...@gmail.com> added the comment:

I now agree that `# type: ignore` in dict subclasses makes sense the most, and 
exposing the views doesn't solve practical problems.

We talked more with the people who brought this up in typing. Turns out that 
the correct solution to their problems was to just inherit from MutableMapping 
instead of inheriting from dict. If you really need to inherit from dict and 
make .keys() do something else than it does by default, you're most likely 
trying to override all dict methods that do something with the keys, and you 
should just inherit from MutableMapping instead.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46399>
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