Combining marks will continue to be an issue (as they are with iteration),
but I'd expect that code dealing with languages for which combining marks
are a significant thing wouldn't be doing this sort of mapping in the first
place, or will have language-specific rules for handling mapping with
combining marks. If it's a pain point for someone, they can always propose
a locale-specific mapping function standard, perhaps for ECMA-402...
-- T.J. Crowder
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