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shopt -u compat* (re)sets BASH_COMPAT to 51

From: Mihai Moldovan
Subject: shopt -u compat* (re)sets BASH_COMPAT to 51
Date: Sat, 12 Feb 2022 10:11:07 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: x86_64-pc-linux-gnu-gcc
Compilation CFLAGS: -march=native -mtune=native -Wall -pipe -g3 -ggdb3 -gdwarf-4
                    -O2 -fno-omit-frame-pointer
uname output: Linux apgunner 5.15.11 #1 SMP PREEMPT Thu Dec 23 09:06:30 CET 2021
              x86_64 Intel(R) Core(TM) i7-7700K CPU @ 4.20GHz GenuineIntel
Machine Type: x86_64-pc-linux-gnu

Bash Version: 5.1
Patch Level: 16
Release Status: release

        The only way to set a compat level of 50 is to use the BASH_COMPAT
        variable. However, unsetting any compatNN shopt value will (re)set
        BASH_COMPAT to 51 (with bash-5.1), which is not something users might

        Technically, the result isn't wrong, since, i.e., shopt -u compat43 did
        what it was asked to - not setting the compat value to 43. It's
        counter-intuitive and the old value should be retained, though.

        declare -p 'BASH_COMPAT'
        eval "$(shopt -p)"
        # alternatively, a simple shopt -u compat44 would suffice
        declare -p 'BASH_COMPAT'

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