[auzieo]

Those two URLs don't result in the same behaviour. After clicking the first, you have to click back three times to go back to the current page. This would surprise most users.

[jashkenas]

Thanks for reporting that. Here's a commit that improves the hash-to-pushState upgrade by using replaceState instead:

https://github.com/documentcloud/backbone/commit/c39ddd0c16e...

Now, if you click on the first link, and then go back once, you should end up back here.