[issue18986] Add a case-insensitive case-preserving dict

[Antoine Pitrou]

Antoine Pitrou added the comment:

> It would be nice to combine the behaviors that defaultdict and the case-insensitive comparisons.

Any use case? In my experience they are used in completely different
situations. defaultdict mostly to use the writing of some (internal)
algorithms, a case-insensitive dict to store user-visible data.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18986>
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