A bit unrelated... but I find it interesting that the same person who programmed this (csvoss on github) is also the developer of two other projects trending on HN right now.
Python oneliner: https://news.ycombinator.com/item?id=10114969
Retroactive data structures: https://news.ycombinator.com/item?id=10119065
Coincidence? Or is this just a slow hour on HN and good time to get submissions on front page?