[Issue 11229] std.string.toLower is slow

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=11229

--- Comment #3 from Jon Degenhardt <jrdemail2000-dlang at yahoo.com> ---
Thanks for addressing this.

The same treatment could probably be applied to many of the 'is' routines in
std.uni, but the other one that seem likely to be commonly used is
'isPunctuation'. 'isWhite' does something I'm not following, not obvious if it
would benefit. And a combined isAlphaNumeric would be useful.

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