[Bug localedata/30149] en_GB thinks "㐬" and "㒼" are the same character, other locales are fine

["infinity0 at pwned dot gg" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30149

--- Comment #2 from infinity0 at pwned dot gg ---
Thanks for the investigation & explanation. However I can confirm again that
en_US.UTF-8 does indeed work as above for me, giving the correct answer unlike
en_GB which gives the incorrect answer as reported. In fact every other locale
works correctly, except en_GB and surprisingly zh_TW as well:

$ for l in /usr/share/locale/*; do echo $(LC_COLLATE=$(basename $l).UTF-8 sort
-u test2.txt | wc -l) $l; done | grep -v ^2
1 /usr/share/locale/en_GB
1 /usr/share/locale/zh_TW

Furthermore, other character I tried are fine, giving the expected "2" even in
en_GB and zh_TW.

Granted, 㐬 and 㒼 rare characters mostly used for linguistic study purposes and
not everyday use, however they are still certainly distinct characters and the
locale and/or sorting is buggy.

Are you able to replicate this? Feel free to ask me to run stuff on my computer
to debug further, in case my results are different from yours.

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