@Override
  public void isEqualTo(@Nullable Object expected) {
    super.isEqualTo(expected);
  }
@Test
  public void noCommas() {
    // Maybe we should include commas, but we don't yet, so make sure we don't under GWT, either.
    expectFailureWhenTestingThat(array(10000.0)).isEqualTo(array(20000.0));
    assertFailureValue("expected", "[20000.0]");
    assertFailureValue("but was", "[10000.0]");
  }