public FEELFnResult<BigDecimal> invoke(@ParameterName( "n" ) BigDecimal n) {
        return invoke(n, BigDecimal.ZERO);
    }
@Test
    void invokeRoundingEven() {
        FunctionTestUtil.assertResult(roundHalfUpFunction.invoke(BigDecimal.valueOf(10.25)), BigDecimal.valueOf(10));
        FunctionTestUtil.assertResult(roundHalfUpFunction.invoke(BigDecimal.valueOf(10.25), BigDecimal.ONE),
                                      BigDecimal.valueOf(10.3));
    }