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

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

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

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

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

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

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

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