Extensive discussion here: https://news.ycombinator.com/item?id=6181081 https://news.ycombinator.com/item?id=6181081 and here https://news.ycombinator.com/item?

Extensive discussion here: https://news.ycombinator.com/item?id=6181081 https://news.ycombinator.com/item?id=6181081 and here https://news.ycombinator.com/item?id=6180846 https://news.ycombinator.com/item?id=6180846.