@Override
    protected boolean isNan(Float number) {
        return number.isNaN();
    }
@Test
    void testIsNan() {
        FloatSummaryAggregator ag = new FloatSummaryAggregator();
        assertThat(ag.isNan(-1.0f)).isFalse();
        assertThat(ag.isNan(0.0f)).isFalse();
        assertThat(ag.isNan(23.0f)).isFalse();
        assertThat(ag.isNan(Float.MAX_VALUE)).isFalse();
        assertThat(ag.isNan(Float.MIN_VALUE)).isFalse();
        assertThat(ag.isNan(Float.NaN)).isTrue();
    }