Unlearning is always much harder than learning. I know that when I'm debugging a piece of code, and I get an idea in my head about how it works or should work,

Unlearning is always much harder than learning. I know that when I'm debugging a piece of code, and I get an idea in my head about how it works or should work, and that idea is shown to be wrong by clear and incontrovertible evidence, it can still take between a few hours and a few days for me to stop thinking it.