}
    return new LongArrayAsList(backingArray);
  }

  @GwtCompatible
  private static class LongArrayAsList extends AbstractList<Long>
      implements RandomAccess, Serializable {
    final long[] array;
    final int start;
    final int end;

    LongArrayAsList(long[] array) {
      this(array, 0, array.length);
    }

    LongArrayAsList(long[] array, int start, int end) {