The filename_trans code had a bug where duplicate detection was being
    done between the unmapped type value of a new rule and the type value of
    rules already in policy.  This meant that duplicates were not being
    silently dropped and were instead outputting a message that there was a
    problem.  It made things hard because the message WAS using the mapped
    type to convert to the string representation, so it didn't look like a
    dup!