Make $expiry optional in Memory::write as in other adapters.
Make $expiry optional in Memory::write as in other adapters.

m4rcsch/lithium-core-library,davidpersson/lithium,graphis/lithium,whowgames/lithium,datachand/lithium,whowgames/lithium,muyehub/lithium,muyehub/lithium,wbeater/lithium,jails/lithium,UnionOfRAD/lithium,pixelcog/lithium,datachand/lithium,graphis/lithium,jails/lithium,davidpersson/lithium,wbeater/lithium,pixelcog/lithium,UnionOfRAD/lithium,m4rcsch/lithium-core-library