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