Following test fails on 1.2 version:

    @Test public void changingModelClass() throws Exception {
        final MyY myY = new MyY("Ahoj", 0);
        MyX p = Models.bind(
            new MyX(myY, new MyY("Hi", 333), new MyY("Hello", 999)),
            c)
        .applyBindings();
        MyY realY = p.getOne();

        Map m = (Map)Models.toRaw(p);
        Object v = m.get("one");
        assertNotNull(v, "Value should be in the map");
        assertEquals(v.getClass(), One.class, "It is instance of One");
        One o = (One)v;
        assertEquals(o.changes, 0, "No changes so far");
        assertFalse(o.pb.isReadOnly(), "Normal property");
        assertEquals(o.get(), myY);
        assertSame(o.get(), realY);

        final MyY newY = new MyY("Hi", 1);
        p.setOne(newY);

        assertSame(p.getOne(), newY);
        assertEquals(o.changes, 1, "One change");
    }