assertFalse(new ActivationOS().equals(null));

        new ActivationOS().equals(new ActivationOS());
    }

    @Test
    void testEqualsIdentity() {
        ActivationOS thing = new ActivationOS();
        assertTrue(thing.equals(thing));
    }

    @Test
    void testToStringNullSafe() {
        assertNotNull(new ActivationOS().toString());
    }

        new PluginConfiguration().equals(new PluginConfiguration());
    }

    @Test
    void testEqualsIdentity() {
        PluginConfiguration thing = new PluginConfiguration();
        assertTrue(thing.equals(thing));
    }

    @Test
    void testToStringNullSafe() {
        assertNotNull(new PluginConfiguration().toString());
    }

        assertFalse(new ReportPlugin().equals(null));

        new ReportPlugin().equals(new ReportPlugin());
    }

    @Test
    void testEqualsIdentity() {
        ReportPlugin thing = new ReportPlugin();
        assertTrue(thing.equals(thing));
    }

    @Test
    void testToStringNullSafe() {
        assertNotNull(new ReportPlugin().toString());
    }

        assertFalse(new Reporting().equals(null));

        new Reporting().equals(new Reporting());
    }

    @Test
    void testEqualsIdentity() {
        Reporting thing = new Reporting();
        assertTrue(thing.equals(thing));
    }

    @Test
    void testToStringNullSafe() {
        assertNotNull(new Reporting().toString());
    }

        assertFalse(new License().equals(null));

        new License().equals(new License());
    }

    @Test
    void testEqualsIdentity() {
        License thing = new License();
        assertTrue(thing.equals(thing));
    }

    @Test
    void testToStringNullSafe() {
        assertNotNull(new License().toString());
    }

    public void testToStringNotNonsense() {

        }

        fun newApi(thing: String, desc: String): String =
            "$thing ${describe(thing, desc)}: New public API in 2.0 (@Incubating)"

        fun added(thing: String, desc: String): List<String> =
            listOf(
                "$thing ${describe(thing, desc)}: Is not annotated with @Incubating.",
                "$thing ${describe(thing, desc)}: Is not annotated with @since 2.0."
            )

I think `Union[SomeType, None]` is more explicit about what it means.

It's just about the words and names. But those words can affect how you and your teammates think about the code.

As an example, let's take this function:

{* ../../docs_src/python_types/tutorial009c.py hl[1,4] *}

        new ActivationProperty().equals(new ActivationProperty());
    }

    @Test
    void testEqualsIdentity() {
        ActivationProperty thing = new ActivationProperty();
        assertTrue(thing.equals(thing));
    }

    @Test
    void testToStringNullSafe() {
        assertNotNull(new ActivationProperty().toString());
    }

        assertFalse(new Developer().equals(null));

        new Developer().equals(new Developer());
    }

    @Test
    void testEqualsIdentity() {
        Developer thing = new Developer();
        assertTrue(thing.equals(thing));
    }

    @Test
    void testToStringNullSafe() {
        assertNotNull(new Developer().toString());
    }

        assertFalse(new Parent().equals(null));

        new Parent().equals(new Parent());
    }

    @Test
    void testEqualsIdentity() {
        Parent thing = new Parent();
        assertTrue(thing.equals(thing));
    }

    @Test
    void testToStringNullSafe() {
        assertNotNull(new Parent().toString());
    }