public static Builder custom() {
        return new Builder();
    }
@Test
    public void shouldCreatePercentCutoff() {
        HedgeConfig config = HedgeConfig.custom()
            .averagePlusPercentageDuration(100, false).build();

        then(HedgeDurationSupplier.fromConfig(config)).isInstanceOf(AverageDurationSupplier.class);
    }