The test in 005_char_signedness.pl was missing a dash in the
--set-char-signedness option. Although the test didn't fail since it
doesn't check the error message, it resulted in an unexpected error
message instead of the intended one.
Oversight in 
1aab680591.
Author: Dagfinn Ilmari MannsÃ¥ker <
[email protected]>
Discussion: https://postgr.es/m/
[email protected]
 
                '-s', $new->host,
                '-p', $old->port,
                '-P', $new->port,
-               '-set-char-signedness', 'signed',
+               '--set-char-signedness', 'signed',
                $mode
        ],
        '--set-char-signedness option cannot be used for upgrading from v18 or later'