celluloid/celluloid — pull request #281 by halorgium (2013-06-18 07:05:48+00:00)
Title: Always create a Task regardless of the Actors exclusives

This change means that we need a new concept to distinguish the old
behavior which did not create a Task, but instead gave users direct
exclusive access to the actor Thread.

I think people should use one or the other and never use the actor thread.