This was linked-to from the post corresponding to https://news.ycombinator.com/item?id=4789747 https://news.ycombinator.com/item?id=4789747 as well as from its

This was linked-to from the post corresponding to https://news.ycombinator.com/item?id=4789747 https://news.ycombinator.com/item?id=4789747 as well as from its comments. Note that this was previously submitted as https://news.ycombinator.com/item?id=4698111 https://news.ycombinator.com/item?id=4698111, but didn't attract any discussion at the time.