Add (failing) test of builtin prototype identity after roundtrip
Add (failing) test of builtin prototype identity after roundtrip

This is failing because we do not serialise Interpreter.OBJECT et al.

google/CodeCity,NeilFraser/CodeCity,google/CodeCity,google/CodeCity,NeilFraser/CodeCity,google/CodeCity,NeilFraser/CodeCity,NeilFraser/CodeCity