anchor.diff:        removed++;
         size--;
   
  -      if (!desc) {
  +      if (!_desc) {
           idx = size - populatePages - i - 1;
   
           if (idx == -1) break;
  
positive.code: 
          mergeFn(update, pair);
  
          if (desc) {
            idx = populatePages + i;
  
            if (idx == size) break;
  
negative.code:     $state.loading = true;
      return true;
    }
  
    bool fetchUpdate({
      bool debounce = false,
  