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Fixes #203
@gvanrossum
This is a simple-minded fix. Basically, I just copied some parts from #207 + small tweaks + backport to Python 2. Note that this makes classes inherited from typing.Mapping etc. real ABCs, i.e. they could not be instantiated without implementing all the abstract methods (in this sense typing.X and collections.abc.X are identical).

Please take a look.

@gvanrossum
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Thanks! I will not pretend I understand everything that's going on, but we have enough tests that I sort of believe it's better, not worse.

Have you thought more about Union[Any, x]?

@bintoro
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bintoro commented Sep 29, 2016

@ilevkivskyi #207 added a few more tests that I believe are important. Did you omit them intentionally?

@ilevkivskyi
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@gvanrossum I will make PRs about Union[Any, x] later today, we could discuss details in those PRs.

@bintoro Could you please point more precisely to the tests (line numbers/names)? Most probably I just overlooked them (I added some tests in my previous PR).

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bintoro commented Sep 29, 2016

@ilevkivskyi Have a look from this line on. Not all of them are applicable anymore, but most are.

The code interacting with the ABC machinery is somewhat intricate (and could actually use a thorough review), so it's important to test it works with things like register() and custom subclasshooks.

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@bintoro Thanks! I will make a PR with these tests later, right after I finish with Union[X, Any].

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typing.MutableMapping not a drop-in replacement for collections.abc.MutableMapping

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