CashRounding fails on input with no decimals

[HonoluluHenk]

This fails, interestingly only for in put with scale=0

        @ParameterizedTest
        @CsvSource({
            "6   , 6.00",
        })
        void rounds_on_more_or_less_precission(BigDecimal input, BigDecimal expected) {
            var actual = cashRounding.round(input);

            assertThat(actual)
                .isEqualTo(expected);
        }