Actor.immutable returning Behaviour[T] makes sense as it uses recursion to 
return updated state or Actor.stopped etc. 

But in MutableBehavior, I end up using this pattern a lot.

override def onMessage(msg: Msg): Behavior[Msg] = {
    msg match {
        case M1 => //unit returning action
        case M2 => //unit returning action
    }
    this
}


Which makes me wonder what use cases are helped by onMessage returning 
Behaviour type (instead of Unit). Any thoughts?

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