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@JelleZijlstra
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This came up in python/typing#366.

- It didn't exist before 3.3 (https://docs.python.org/3/library/collections.html#chainmap-objects)
- It's not a subclass of dict
@gvanrossum
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Yay! (Maybe you could also add a third_party version for the backport? https://bitbucket.org/jeunice/chainmap -- though it claims 2.7 has it in the stdlib which I think is wrong.)

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