Shopify/batman — pull request #422 by robholland (2012-05-10 21:23:27+00:00)
Title: Fix attempt to access dirtyKeys before it's setup.

After updating our project to latest batman master we had problems with url() trying to read this.dirtyKeys which hadn't yet been setup. Changing to .get('dirtyKeys') made things happy again.

I haven't written a test for this, but if you need one to prevent regression let me know, I'll try and write one.