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

[Terry J. Reedy]

Change by Terry J. Reedy <tjreedy at udel.edu>:


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stage:  -> test needed
versions:  -Python 3.5, Python 3.6

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