So I finally got to test that stuff I wrote yesterday and to my surprise I did not read what I expected. Because I learned that I made a big mistake three months ago when I wrote some phrases to keep track of what Buls changed, setting a boolean value to the opposite I intended.
And while I didn't use these directly, I did use them in my first exercise code, so it's a good thing I'm close to running all of the tests, because I now don't know if those work correctly!