documentcloud/backbone — pull request #2286 by MarcoPeraza (2013-02-18 22:03:03+00:00)
Title: Fire 'invalid' callback when _validate fails

This is the behavior described in the comment for _validate and also makes it consistent with the handling of server errors through the 'error' callback. I explain my justification here: https://github.com/documentcloud/backbone/pull/2280