bug#37177: sort don't respect the ASCII order

[Xavier Sanchez]

Linux snake 5.2.0-2-amd64 #1 SMP Debian 5.2.9-2 (2019-08-21) x86_64 GNU/Linux
coreutils: 8.30-3+b1 on Debian 10

Hello, here's the test I'm using doing cross platforms verifications:

#!/bin/sh
seq() (
        first=$1 incr=$2 last=$3
        echo "for (i = $first; i <= $last; i+=$incr) i" | bc -l
)

_sha256() {
        sha256sum 2>/dev/null || sha256
}

# shellcheck disable=SC2059
ascii_seq="$(
        for i in $(seq 33 1 126); do
                printf "\\$(printf %03o "$i")\\n"
        done
)"

echo ASCII
printf %s\\n "$ascii_seq" | _sha256

echo SORT
printf %s\\n "$ascii_seq" | sort | _sha256
### end

--- >Resulsts:

Coreutils's 8.30-3+b1:
ASCII
d39a8797c560b434fe58e910a31c4e5454a6626602b7114a41509fa12792c1a2  -
SORT
d4225db1191701c182feba79f67d3b4d824bc8e90164d7fe55bdb3d34b71406d  -

Busybox 1.30.1 (Alpine Linux):
ASCII
d39a8797c560b434fe58e910a31c4e5454a6626602b7114a41509fa12792c1a2  -
SORT
d39a8797c560b434fe58e910a31c4e5454a6626602b7114a41509fa12792c1a2  -

More explicit example:

Coreutils's 8.30-3+b1: find . | sort
.
./files
./files/$-e
./files/ascii1
./files/ascii2
./files/!-e
./files/#-e
./files/?-e
./files/empty1
./files/empty2
./files/filename with space
./files/subdir
./files/subdir/empty3
./files/subdir with space
./files/subdir with space/empty4
./tests.sh

Busybox 1.30.1 (Alpine Linux): find . | sort
.
./files
./files/!-e
./files/#-e
./files/$-e
./files/?-e
./files/ascii1
./files/ascii2
./files/empty1
./files/empty2
./files/filename with space
./files/subdir
./files/subdir with space
./files/subdir with space/empty4
./files/subdir/empty3
./tests.sh

I think something is broken in that version thus I did not verified one newer
ones but I think it's worth writing it there.

-- 
Xavier