> * State in old system isn’t representable in new system (not a backwards compatible upgrade or more likely a bug exists in handling the new state)
New system starts in a backwards compatible mode where it accepted all state that was representable in old system. Transition is achieved after the upgrade, with flag variables.
New system starts in a backwards compatible mode where it accepted all state that was representable in old system. Transition is achieved after the upgrade, with flag variables.