GNU coreutilsのtrue、オプションがある！！！！
https://github.com/coreutils/coreutils/blob/master/src/true.c
つまりfalseがsuccessfullyに終わる可能性が……？
いや、EXIT_STATUSだからfalseは失敗しますね
$ /bin/false --help > /dev/null ; echo $?1
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