[Issue 11911] Add Unicode correct case-insensitive variations of string functions

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=11911

berni44 <bugzilla at d-ecke.de> changed:

           What    |Removed                     |Added
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                 CC|                            |bugzilla at d-ecke.de
           Severity|normal                      |enhancement

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