--equal does not work on files with numerical uid or gid #234
Description
On Ubuntu Linux. rmlint --equal reports files as different if one of them has a numerical uid or gid that is not in /etc/passwd.
Let's say I am user alice, and user bob also exists on the system:
$ cp testfile file1
$ cp testfile file2
$ rmlint --equal file1 file2 ; echo $?
0
$ sudo chown bob:bob file1
$ rmlint --equal file1 file2 ; echo $?
0
$ sudo chown bob:789 file1
$ rmlint --equal file1 file2 ; echo $?
1
$ diff file1 file2 ; echo $?
0
$ cmp file1 file2 ; echo $?
0
$ sudo chown 789:bob file1
$ rmlint --equal file1 file2 ; echo $?
1
$ cmp file1 file2 ; echo $?
0
$ diff file1 file2 ; echo $?
0
$ sudo chown bob:bob file1
$ rmlint --equal file1 file2 ; echo $?
0