assertDoesntActuallyTrim(iia.subArray(0, 3));
    assertActuallyTrims(iia.subArray(0, 2));
    assertActuallyTrims(iia.subArray(1, 3));

    ImmutableLongArray rightSized = ImmutableLongArray.builder(3).add(0).add(1).add(3).build();
    assertDoesntActuallyTrim(rightSized);

    ImmutableLongArray overSized = ImmutableLongArray.builder(3).add(0).add(1).build();
    assertActuallyTrims(overSized);