The following program takes as input the LATIN script range and reorder it
based on rules that allow [a-z] and [A-Z] to work as expected.
glibc implements ISO POSIX-2:1993 requirements and so uses collation element
order (CEO) as the basis for range expressions. Therefore we can re-arrange the
range elements while still keeping the ISO 14651 sorting.
This means we can meet the range requirements we want and the sorting we want.
I don't see any downside to this. Further we can create 3 distinct ranges in
iso14651_t1_common wihtout breaking collation and those ranges would only
contain a-z, A-Z, and 0-9 and implement what Florian and Rich are suggesting
for all locales that use iso14651_t1_common collation.
The 15 locales that don't use iso14651_t1_common will not be changed since
that's the most conservative solution.
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