Posted months after part 1 (discussed at https://news.ycombinator.com/item?id=11289406 https://news.ycombinator.com/item?id=11289406), but a scant few days afte

Posted months after part 1 (discussed at https://news.ycombinator.com/item?id=11289406 https://news.ycombinator.com/item?id=11289406), but a scant few days after https://news.ycombinator.com/item?id=12563254 https://news.ycombinator.com/item?id=12563254 . (-: