I might be wrong about the initial intention, but it's been the norm as long as I can remember, here is a comment from pg in 2008. http://news.ycombinator.com/

I might be wrong about the initial intention, but it's been the norm as long as I can remember, here is a comment from pg in 2008. http://news.ycombinator.com/item?id=117171 http://news.ycombinator.com/item?id=117171