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https://github.com/unicode-rs/unicode-width/blob/master/scripts/unicode.py#L304 has special-casing for U+1160..U+11FF (decimal 4448..4607, what's with using decimal values anyway?) (the part of the Hangul Jamo block which contains medial/vowels/jungseong and final/trailing_consonants/jongseong Jamo), to treat it as 0-width.
The Hangul Jamo Extended-B block at U+D7B0..U+D7FF contains jungseong and jongseong for Old Korean, and should be treated the same as U+1160..U+11F0.
glibc's wcwidth() treats that block as 0 width since:
commit 6e540caa21616d5ec5511fafb22819204525138e
Author: Mike FABIAN <mfabian@redhat.com>
Date: Tue Jun 16 08:29:40 2020 +0200
Set width of JUNGSEONG/JONGSEONG characters from UD7B0 to UD7FB to
0 [BZ #26120]
Reviewed-by: default avatarCarlos O'Donell <carlos@redhat.com>
diff --git a/localedata/charmaps/UTF-8 b/localedata/charmaps/UTF-8
index 14c5d4fa33..8cce47cd97 100644
--- a/localedata/charmaps/UTF-8
+++ b/localedata/charmaps/UTF-8
@@ -48920,6 +48920,8 @@ WIDTH
<UABE8> 0
<UABED> 0
<UAC00>...<UD7A3> 2
+<UD7B0>...<UD7C6> 0
+<UD7CB>...<UD7FB> 0
<UF900>...<UFA6D> 2
<UFA70>...<UFAD9> 2
<UFB1E> 0
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