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

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Surely a case-insensitive dict should use str.casefold, not
> str.lower?

Perhaps. Network protocols will usually only allow ASCII in parts
where case is insensitive (e.g. header names), so it shouldn't make a
difference.

Implementing the generic pattern means this is left at the user's
discretion, though.

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