}
      };
    }

    @Override
    Spliterator<Entry<C, V>> entrySpliterator() {
      updateBackingRowMapField();
      if (backingRowMap == null) {
        return Spliterators.emptySpliterator();
      }
      return CollectSpliterators.map(backingRowMap.entrySet().spliterator(), this::wrapEntry);
    }

    Entry<C, V> wrapEntry(Entry<C, V> entry) {
      return new ForwardingMapEntry<C, V>() {