public static IntArrayList rangeClosed(int startIncl, int endIncl) {
        return range(startIncl, endIncl + 1);
    }
@Test
    public void testRangeClosed() {
        assertEquals(from(3, 4, 5, 6, 7), ArrayUtil.rangeClosed(3, 7));
        assertEquals(from(-3, -2, -1), ArrayUtil.rangeClosed(-3, -1));
        assertEquals(from(5), ArrayUtil.rangeClosed(5, 5));
    }