return Iterators.transform(original.cellSet().iterator(), Tables::transposeCell);
    }

    @Override
    @GwtIncompatible // Spliterator
    Spliterator<Cell<C, R, V>> cellSpliterator() {
      return CollectSpliterators.map(
          original.cellSet().spliterator(),
          Spliterator.DISTINCT | Spliterator.NONNULL,
          Tables::transposeCell);
    }
  }

  private static <