Issue #2340507 by chx, Wim Leers: Make the new AccessResult API and implementation even better.

core/lib/Drupal/Core/Access/AccessManager.php

core/lib/Drupal/Core/Access/AccessResult.php

core/lib/Drupal/Core/Access/AccessResultAllowed.php

core/lib/Drupal/Core/Access/AccessResultForbidden.php

core/lib/Drupal/Core/Access/AccessResultInterface.php

core/lib/Drupal/Core/Access/AccessResultNeutral.php

core/lib/Drupal/Core/Access/CsrfAccessCheck.php

core/lib/Drupal/Core/Access/DefaultAccessCheck.php

core/lib/Drupal/Core/Block/BlockBase.php

core/lib/Drupal/Core/Entity/EntityAccessCheck.php

core/lib/Drupal/Core/Entity/EntityAccessControlHandler.php

core/lib/Drupal/Core/Entity/EntityCreateAccessCheck.php

core/modules/block/block.api.php

core/modules/comment/src/CommentAccessControlHandler.php

core/modules/contact/src/Access/ContactPageAccess.php

...lation/src/Access/ContentTranslationManageAccessCheck.php

...anslation/src/Access/ContentTranslationOverviewAccess.php

core/modules/field_ui/src/Access/FormModeAccessCheck.php

core/modules/field_ui/src/Access/ViewModeAccessCheck.php

core/modules/file/src/FileAccessControlHandler.php