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It is now safe to cache a reference to a cache and expect consistent results. Changing identifiers altered cache results where a reference was held to the cache. Identifiers have been set to be cached with identifiers included so the caches are separate. As a consequence of this it was identified that invalidation events and identifiers don't easily work together as an event can't determine which identifiers should be used for cache invalidation. So invalidation events have been made incompatible with identifiers being set. No core code used this combination as it's not possible to understand any expected behaviour. Event invalidation for application and session caches was centralised to the same location. The only difference was the name of the lastinvalidation variable. This improves support and consistency of invalidation code.