As mentioned by the parent, that's a feature, not a bug. Also, if you type in and hit ctrl+enter, it'll add www. to the from and
.com to the end. (Same behavior as in IE.) I use these features all the time.
I know some people will say "just type in and hit enter and the browser will figure it out for you" (especially with Safari) but 1) that's not as fast and 2) I want to resolve to ., not some random DNS name the browser chooses for me.