anchor.diff:          grouping: event.grouping,
           includeActivity: event.includeActivity,
           user: event.user,
  -        userId: event.userId == -1 ? null : event.userId,
  +        userId: event.userId,
           ratingKey: event.ratingKey,
           parentRatingKey: event.parentRatingKey,
           grandparentRatingKey: event.grandparentRatingKey,
  
positive.code:         grouping: event.grouping,
          includeActivity: event.includeActivity,
          user: event.user,
          userId: event.userId == -1 ? null : event.userId,
          ratingKey: event.ratingKey,
          parentRatingKey: event.parentRatingKey,
          grandparentRatingKey: event.grandparentRatingKey,
  
negative.code:           state.copyWith(
              status: BlocStatus.success,
              history: libraryHistoryCache[cacheKey],
              hasReachedMax: libraryHistoryCache[cacheKey]!.length < length,
            ),
          );
        }
  