ObjectReference.equals spec says:
returns true if the Object is an ObjectReference, if the ObjectReferences belong to the same VM, and if applying the "==" operator on the mirrored objects in that VM evaluates to true.
If ObjectReference was created during value object ctor, we can get 2 different ObjectReference (with different objectIDs) for equal value objects.

Also need to update ObjectReference.hashCode to be consistent with ObjectReference.equals