Status: IN
Flyweight's permission of UnsharedConcreteFlyweight objects — conforming to the Flyweight interface but not actually shared — validates the Prototype-Flyweight identity spectrum as a genuine continuum rather than two discrete endpoints: the unshared flyweight occupies the interior of the spectrum (using Flyweight's interface but Prototype's independence), just as copy-on-write Proxy dynamically mediates between the endpoints.
Unshared flyweights and copy-on-write together confirm the identity spectrum is continuous, not binary
Depends on (SL): flyweight-unshared-concrete-valid, copy-on-write-mediates-identity-sharing-spectrum