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Subject: bash 5.2.21-1: a bug in [0-9] expansion
To: Cygwin List <cygwin AT cygwin DOT com>
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From: Mariusz Wodzicki via Cygwin <cygwin AT cygwin DOT com>
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Description of the problem.
[0-9]  picks also certain Unicode superscript characters ( namely, ⁰ ⁴ ⁵ ⁶
⁷ ⁸ ⁹ ), and every Unicode subscript character.

Example: the directory has the following files:
$ /bin/ls
₀.txt  ₁.txt  ₂.txt  ₃.txt  ₄.txt  ₅.txt  ₆.txt  ₇.txt  ₈.txt  ₉.txt
⁰.txt  ¹.txt  ².txt  ³.txt  ⁴.txt  ⁵.txt  ⁶.txt  ⁷.txt  ⁸.txt  ⁹.txt

$ /bin/ls [0-9].txt
₀.txt  ₁.txt  ₃.txt  ⁴.txt  ⁵.txt  ⁶.txt  ⁷.txt  ⁸.txt
⁰.txt  ₂.txt  ₄.txt  ₅.txt  ₆.txt  ₇.txt  ₈.txt

$ locale
LANG=en_US.UTF-8
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_ALL=

System.
Fully up to date Windows 11
cygwin 3.6.4-1
bash    5.2.21-1

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