[issue38538] dictobject dictviews don't return NotImplemented for unrecognized types.

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

> but it's not that simple as the __or__ of dictviews is less strict that the __or__ of set: __or__ of dictview accept any iterable, __or__ of set only accepts sets.

I want to make it same to set.
But it is a backward incompatible...

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38538>
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