Blueprint property resolution fails for setters with derived type

Blueprint property resolution expects getter and setter methods to use exactly the same class. It should allow setters that take a derived type using isAssignableFrom() instead of equals(). It currently fails for the following:

    class A {
        private X x;
        public X getX() { return x; }
        public void setX(X x) { this.x = x; }
    }

    class B extends A {
        public void setX(Y y) { super.setX(y); } // Y extends X
    }

Trying to set property X for bean B using Blueprint fails.