anchor.diff:            filter.configurationGroups.any(configuration.startsWith));
   }
   
  -class Change {
  +class Change implements Comparable {
     Change._(
         this.id,
         this.name,
  
positive.code:       for (final configuration in map.keys)
          [
            for (final change in map[configuration].keys)
              map[configuration][change]
          ]
      ];
    }
  
negative.code:       pinnedIndex,
        trivialBlamelist);
  
    int compareTo(Object other) => name.compareTo((other as Change).name);
  
    String get resultStyle => result == expected ? 'success' : 'failure';
  }
  
  