in core/src/main/scala/org/apache/pekko/projection/internal/HandlerAdapter.scala [31:36]
def apply[Envelope](delegate: javadsl.Handler[Envelope]): scaladsl.Handler[Envelope] = {
delegate match {
case a: javadsl.ActorHandler[Envelope, Any] @unchecked => new ActorHandlerAdapter[Envelope](a)
case _ => new HandlerAdapter(delegate)
}
}