https://pekko.apache.org/japi/pekko/current/org/apache/pekko/actor/typed/internal/BehaviorImpl.ReceiveMessageBehavior.html
BehaviorImpl.ReceiveMessageBehavior
https://pekko.apache.org/japi/pekko/current/org/apache/pekko/actor/typed/internal/BehaviorImpl.ContextAs$.html
BehaviorImpl.ContextAs$