Three Dollar Quill

I'm looking over the Matrix code again, and coming to the conclusion that I need to review and revise the documentation. There are a bunch of ideas in there about set operations, and it's not obvious what I'm trying to guarantee. Also, some stuff is either counter-intuitive or wrong. Furthermore, I'll need to figure out what kinds of tests to write for the new code, and write them.

I don't have the time or energy for that right now, though. I need to wind down.

Good night.