Some non-ASCII name wrote:
3. the general category of all code points, is one of { Ll, Lo, Lm,
Mn }.
If you want more clarification than that (and the reference to
> RFC5890 where it is discussed further), please send text.
OK. Add the following:
As the upper case character corresponding to 'y' with diaeresis
is not uniquely defined, for example, localized domain names
are unusable
It should be noted that, extended case insensitivities beyond
European characters, such as correspondence between Chinese
ones, the problem is even more unsolvable.
It should clarify how localized domain names are useless.
Masataka Ohta
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