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

[Antoine Pitrou]

Antoine Pitrou added the comment:

Ok, let's bikeshed this a bit. What should be the name?
- projectdict?
- normalizedict?
- normdict?
- derivedict?
- transformdict?
- any ideas?

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