Tiny bugfixes would have been fine - except when I am at my most neuro sedated (like a horse tranquilliser!). But these ones the other night were really quite tricky and convoluted. I also had to figure out a new algorithm for one of them. So I'm surprised I was awake enough to manage that, given how I was earlier.

Since then I've also done a big restructuring of the code (which turned out vastly simpler than I expected it would). So am now back to very tiny fixes for the next 2 weeks. Which is great!