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

[Antoine Pitrou]

Antoine Pitrou added the comment:

For the record, I have my own implementation here:
https://bitbucket.org/optiflowsrd/obelus/src/tip/obelus/casedict.py?at=default
https://bitbucket.org/optiflowsrd/obelus/src/tip/obelus/test/test_casedict.py?at=default

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