Thank you for your excellent feedback.

Yes, andro.eventer is there to avoid polluting the owner object. However, your idea of passing andro to the behaviour's setup() method is a great one. I'm going to give it a try.

The reason I require the behaviour to be passed to bind() is so that the passed function can be run with `this` set to the behaviour. I couldn't see another way to let bind know which behaviour should be bound to the event.