Do you think you could add a test case?

http://phpfashion.com/jak-komitovat-se-zarucni-smlouvou

Hehe, I thought someone will probably ask.

Well, I had the test written before the fix. I actually am fan of TDD.

$h = Passwords::hash('dg', array('cost' => 31));
Assert::true(Passwords::verify('dg', $h));

It would verify that the bug is there in the first place.

But after some time of wondering why tests seem to not run at all, it turns out computers have hard time calculating hash with cost 31 and the test would never complete on my PC, so I just deleted it.

I think it's not worth the trouble for such a trivial thing.

Anyway, I read that article by dg last week and use it to advocate unit testing in our company ;-)