Preparing for the workshop https://liveprog.org/ A day before I started to see how to enable changing the past when doing time travel in the live programming environment. But it required replacing the underlying data structure. So, I decided against it. Who would be that silly to do a complete rewrite just before the talk? Then, family was watching baseball, so in the evening I did it anyway. Happy handcoding good vibe! When understanding is ripe, things fall into place easily.