The Javascript Date class is so criminally bad, that you will have a better score if you give random answers than if you try to reason about it.

I’ve found it very useful to use jj to continuously and automatically snapshot the changes that Claude makes. This way if it does anything that I didn’t want, it’s incredibly easy to undo it and still keep a clean history.

At scale you will be slapped in the face by this tail or that all the time. It’s a clear and simple argument to rehabilitate the mean as the measurement we should be looking at.