Per my test in CentOS, the sort order of UTF-8 characters were completely different between locale C, ja_JP.UTF-8 and en_US.UTF-8.
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I'm told JIS X 4061 offers the most useful sort order for Japanese, but unsupported by glibc: userguide.icu-project.org/collation/conc
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Should we still rely on only the glibc implementation? Could we have another solution?
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Personally, I believe that ICU support would be very useful, for several reasons.
Interesting. I have heard about ICU, but not familiar so far. Will look into it how it would be beneficial.