Yes it is about Unicode. "Unicode" is in the subject.
Sorry for not setting the subject correctly. Fixed.
Every time it reverses a Unicode string, it performs a Unicode operation.
We've both said that it doesn't. At issue is whether it should. I would like it to, but I'm not sure it's possible.
What kind of operation is this Perl code performing?
A substitution based on a Unicode property match.
Not a Unicode operation?
I agree that it is. substr, length and reverse are not, though.
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