documentcloud/backbone — pull request #2191 by byroot (2013-01-25 15:34:55+00:00)
Title: Improve consistency: get rid of "a zealous early error breaking apps in inconvenient ways"

Since jQuery.on() and Backbone.Events.on are silently ignoring invalid callbacks,
Backbone.View.delegateEvents should too.

See #2184 for previous discussion about how Backbone is supposed to behave on obvious developer errors