Thank you! Nice explanation of how you did it, combined with a useful result, makes for a great "Show HN". Bravo!
Incidentally those are reasons why it's a bad Show HN thread: https://news.ycombinator.com/showhn.html > Blog posts, sign-up pages, and fundraisers can't be tried out, so they can't be Show HNs.
Whoops! I've been here long enough I should've known better. Thanks minimaxr