@Test
    void testDelimiters() {
        assertOrder(X_EQ_Y, "1.0", "1-0");
        assertOrder(X_EQ_Y, "1.0", "1_0");
        assertOrder(X_EQ_Y, "1.a", "1a");
    }

    @Test
    void testLeadingZerosAreSemanticallyIrrelevant() {
        assertOrder(X_EQ_Y, "1", "01");
        assertOrder(X_EQ_Y, "1.2", "1.002");
        assertOrder(X_EQ_Y, "1.2.3", "1.2.0003");
        assertOrder(X_EQ_Y, "1.2.3.4", "1.2.3.00004");
    }