stty: negated operands rejected by clap

[andrewliebenow]

❯ coreutils stty -ixon ; coreutils printf '%s\n' "${?:?}"
error: unexpected argument '-i' found

  tip: to pass '-i' as a value, use '-- -i'

Usage: coreutils stty [-F DEVICE | --file=DEVICE] [SETTING]...
       coreutils stty [-F DEVICE | --file=DEVICE] [-a|--all]
       coreutils stty [-F DEVICE | --file=DEVICE] [-g|--save]

For more information, try '--help'.
1

❯ /usr/bin/stty -ixon ; coreutils printf '%s\n' "${?:?}"
0

See #6798