anchor.diff:     */
     Future prio(int priority, int start, {int end}) {
       if(end != null)
  -      return cmd('prio $priority $start $end');
  +      return cmd('prio $priority $start:$end');
       else
         return cmd('prio $priority $start');
     }
  
positive.code:    */
    Future move(int start, int to, {int end}) {
      if(end != null)
        return cmd('move $start $end $to');
      else
        return cmd('move $start $to');
    }
  
negative.code:    */
    Future<List<Map<String, String>>> playlistSearch(int start, {int end}) {
      if(end != null)
        return cmdListMap('playlistsearch $start:$end');
      else
        return cmdListMap('playlistsearch $start');
    }
  