That's exactly the one I had (http://news.ycombinator.org/item?id=3186671 http://news.ycombinator.org/item?id=3186671). I was pretty sure it was non-unique, but

That's exactly the one I had (http://news.ycombinator.org/item?id=3186671 http://news.ycombinator.org/item?id=3186671). I was pretty sure it was non-unique, but I'm glad you checked it properly!