@Immutable
@ElementTypesAreNonnullByDefault
public final class ImmutableLongArray implements Serializable {
  private static final ImmutableLongArray EMPTY = new ImmutableLongArray(new long[0]);

  /** Returns the empty array. */
  public static ImmutableLongArray of() {
    return EMPTY;
  }

  /** Returns an immutable array containing a single value. */
  public static ImmutableLongArray of(long e0) {

    ImmutableLongArray.of(0, 1, 3).subArray(1, 1).stream().forEach(i -> fail());
    assertThat(ImmutableLongArray.of(0, 1, 3).stream().toArray()).isEqualTo(new long[] {0, 1, 3});
  }

  public void testSubArray() {
    ImmutableLongArray iia0 = ImmutableLongArray.of();
    ImmutableLongArray iia1 = ImmutableLongArray.of(5);
    ImmutableLongArray iia3 = ImmutableLongArray.of(5, 25, 125);

    ImmutableLongArray iia0 = ImmutableLongArray.of();
    ImmutableLongArray iia1 = ImmutableLongArray.of(5);
    ImmutableLongArray iia3 = ImmutableLongArray.of(5, 25, 125);

    assertThat(iia0.subArray(0, 0)).isSameInstanceAs(ImmutableLongArray.of());
    assertThat(iia1.subArray(0, 0)).isSameInstanceAs(ImmutableLongArray.of());
    assertThat(iia1.subArray(1, 1)).isSameInstanceAs(ImmutableLongArray.of());

  private void readObject(java.io.ObjectInputStream s)
      throws java.io.IOException, ClassNotFoundException {
    s.defaultReadObject();

    int length = s.readInt();
    ImmutableLongArray.Builder builder = ImmutableLongArray.builder();
    for (int i = 0; i < length; i++) {
      builder.add(doubleToRawLongBits(s.readDouble()));
    }
    this.longs = new AtomicLongArray(builder.build().toArray());
  }

   * the returned list is unspecified.
   *
   * <p>The returned list is serializable.
   *
   * <p><b>Note:</b> when possible, you should represent your data as an {@link ImmutableLongArray}
   * instead, which has an {@link ImmutableLongArray#asList asList} view.
   *
   * @param backingArray the array to back the list
   * @return a list view of the array
   */
  public static List<Long> asList(long... backingArray) {