| ⇢ | A | SessionHandler added |
| ⇢ | B | SessionHandler::__invoke() added | |
| ⇢ | A | FlashMessengerFactory::setSession() added | |
| ⇢ | A | SessionHandler::__construct() added | |
| ⇢ | A | SessionHandler::setSessionAttribute() added | |
| ⇢ | A | SessionHandler::setMessengerAttribute() added | |
| ⇢ | A | SessionHandler::setMessengerNamespace() added |