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

[R. David Murray]

R. David Murray added the comment:

For the record, email is not a good argument for this, since email could not use this data structure (its data structure is *not* a dict, but a list with dict-like features grafted on).

I do think this would be useful, and the generic version (analogous to defaultdict) would seem to make sense.

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