> I would say, as soon as we wrote the expression, because we read a book about how the language works I'm comfortable with that rationale in proportion to how

> I would say, as soon as we wrote the expression, because we read a book about how the language works I'm comfortable with that rationale in proportion to how much I believe the programmer read such a book. I haven't taken the course we teach say, Chemists, I should maybe go audit that, but I would not be surprised if either it never explains this, or the explanation is very hand-wavy, something about it not being exact, maybe invoking old fashioned digital calculators. The amusing thing is when you try to explain this sort of thing with a calculator, and you try a modern calculator, it is much more effective at this than you expected or remember from a 1980s Casio. The calculator in your modern say, Android phone, knows all the stuff you were shown in school, it isn't doing IEEE floating point arithmetic because that's only faster and you're a human using a calculator so "faster" in computer terms isn't important and it has prioritized being correct instead so that pedants stop filing bugs.