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

[R. David Murray]

R. David Murray added the comment:

Indeed.  Although there was apparently some call for it, it doesn't sound from a quick google like defaultdict was deemed to require a PEP.  Presumably the informed audience should be wider than this issue, though.

I also note that defaultdict is implemented via a special method on dict itself (__missing__), and if this one was implemented the same way it would be easy to combine the features.

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