then you should complain and check what's in your mail. The fact that a delivery method is generic isn't a problem, delivering things from A to B is a generic t

then you should complain and check what's in your mail. The fact that a delivery method is generic isn't a problem, delivering things from A to B is a generic task. The recipient of the packet handles the content, the deliverer doesn't care what's in the box. deliver_to ought to be reusable, there shouldn't be 50 versions of it. When we send json over the wire do we rewrite methods globally to make sure we're all in sync about the content? No, you as the message recipient make sure that what you got makes sense and how to deal with it.