*/
@GwtCompatible
@Immutable
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) {

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

    ImmutableLongArray iia = ImmutableLongArray.of(0, 1, 3, 6).subArray(1, 3);
    ImmutableLongArray iia2 = reserialize(iia);
    assertThat(iia2).isEqualTo(iia);
    assertDoesntActuallyTrim(iia2);
  }

  private static void assertActuallyTrims(ImmutableLongArray iia) {
    ImmutableLongArray trimmed = iia.trimmed();