Unicode is finally entering domains which were ASCII-only for decades.
However, with some kinds of identifiers, new problems occur. Such
identifiers are interpreted by humans and machines, and they have to
survive printing and reentering. Furthermore, it might not be
possible to check identifiers online (in contrast to programming
language identifiers). Think of local-parts of email addresses for an
example.
Is it sufficient to mandate that all such identifiers MUST be KC- or
KD-normalized? Does this guarantee print-and-enter round-trip
compatibility?
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