You are correct. There is not a guarantee for the future, though I doubt this behavior will change for V8 (this is currently node only). If that scares you, you can use the combinator syntax (check out the readme towards the bottom). The object literal syntax is just sugar for using combinators.

edit: BTW, if you want some precedence in a major library relying on this behavior, look no further than Backbone's router, specifically the `_bindRoutes` method.