The entire source of news.arc is open - eg http://github.com/nex3/arc/blob/master/news.arc http://github.com/nex3/arc/blob/master/news.arc Lines 1095-1098 cont

The entire source of news.arc is open - eg http://github.com/nex3/arc/blob/master/news.arc http://github.com/nex3/arc/blob/master/news.arc Lines 1095-1098 control whether the downvote arrow is displayed or not. So, to answer your question, yes, it bothers me that there's very rarely a clear enumeration or description of features. On the other hand, it's been a wonderful opportunity to learn Arc. (I'm only half joking - Arc was actually my first stab at functional programming and I probably wouldn't have tried it if pg had bothered to document HN's features)