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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Sorry, I don't understand why it's more useful. We need create a tuple and then index it or unpack it and drop one of elements. This only muddles away a time and programmer's attention.

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