This weekend has been much more busy in $reallife then I had expected. I haven't been able to work on any of the things I was supposed to.
I am continuing to rip out parts of the overly-ambitious IT garbage collector, hoping that a smaller and more modest version will eventually build and start passing tests. After that, there are a lot of places where the algorithm needs to be optimized, but that's a separate task entirely (and not one on my short-term tasklist).
Hopefully I get more done this week to pick up some slack.