I could have sworn I had read this post before, but googling doesn't show any strings from it showing up anywhere else.
It's always disconcerting to get slapped in the face with clear evidence of a memory error. Did I combine https://news.ycombinator.com/item?id=9589223 and http://www.kalzumeus.com/2014/12/22/kalzumeus-software-year-... somehow? Who knows.