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