Issue #2454649 by Aki Tendo, dawehner: Cache Optimization and hardening -- [PP-1] Use assert() instead of exceptions in Cache::merge(Tags|Contexts)

Issue #2526326 by borisson_, Berdir, Wim Leers, Xano: Update CacheableMetadata & AccessResult to use RefinableCacheableDependency(Interface|Trait)

Issue #2428703 by Wim Leers: Add a 'user.permissions' cache context (was: "Should cache contexts be able to associate a cache tag?")

Issue #2331079 by znerol, dawehner: Use RouteMatch in access-checks and remove RequestHelper::duplicate().

Issue #2154435 by andypost, Berdir, mparker17: Rename EntityAccessController to EntityAccessControlHandler.

Issue #697760 by sun: Replace getInfo() in tests with native phpDoc + annotations (following PHPUnit).

Issue #2109035 by tim.plunkett, damiankloip, dawehner, chx: Make access checkers (much) easier to find.

Issue #2066535 by tim.plunkett, jsst, Berdir: Add EntityManagerInterface and stop typehinting with EntityManager.

Issue #2048223 by dawehner, ParisLiakos, herom, fubhy, damiankloip, vijaycs85, joelpittet, tim.plunkett: Add $account argument to AccessCheckInterface::access() method and use the current_user() service.

Issue #2068287 by Berdir, andypost: Support bundle names provided in the request arguments in EntityCreateAccessCheck.

Issue #1979094 by Berdir, dawehner, msonnabaum, tim.plunkett, effulgentsia: Fixed Separate create access operation entity access controllers to avoid costly EntityNG instantiation.

Issue #2028585 by ParisLiakos, dawehner, tim.plunkett: Replace entity_page_create_access() by an access controller.