Thanks, but I don't think that just saying "returns its result" is particularly helpful here -- what is Backbone.sync's result?

Perhaps we should instead mention that it returned the jQuery deferred xhr object (with links to the jQuery docs) in a couple of places instead.

I also added documentation to effect that Backbone.sync returns the result of $.ajax by default. We could be more specific here and say that it returns a jqXHR but that's not true in cases where jQuery is not used as the DOM abstraction library. Is it ok to ignore other DOM libs in this case?

Yep -- we can document for the common case. I'd bet 95%+ of Backbone projects use jQuery.

Sounds good. I'll work up the change later today.

Documented jqXHR in 0ae1627.