docs: public boolean isItemTheSame(@Nullable final T oldItem, @Nullable final T newItem) {
  
          if (oldItem == null && newItem == null) {
              return true;
          }
          if (oldItem == null || newItem == null) {
              return false;
          }
  
          final Object oldId = getItemId(oldItem);
          final Object newId = getItemId(newItem);
  
          return (oldId == newId) || (oldId != null && oldId.equals(newId));
      }