I2JAV11 — Does object reference == ObjectImpl?

Summary: The issue is whether or not code that calls the _this_object method
of the org.omg.PortableServer.Servant class (which is declared to
return an org.omg.CORBA.Object type) can assume that the result
of calling _this_object can be safely cast to ObjectImpl.

The decision of the RTF was that this is a safe assumption, but no
change is necessary to the spec because it is already clearly stated
that all stubs (object references) must be subclasses of ObjectImpl.

closed issue