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

[Demian Brecht]

Demian Brecht added the comment:

> I will be interested to see those reasons.

+1. Something like what this PEP proposed would be beneficial in a few places throughout the library (header and cookie implementations would definitely benefit rather than having to deal with buggy normalization themselves). It’s unfortunate that this isn’t going to be approved.

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<http://bugs.python.org/issue18986>
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