This was submitted last week under a different site: https://news.ycombinator.com/item?id=20507529 https://news.ycombinator.com/item?id=20507529 But this has

This was submitted last week under a different site: https://news.ycombinator.com/item?id=20507529 https://news.ycombinator.com/item?id=20507529 But this has more research and followup.