I agree with the parent. Almost everyone thinks floats are fine. I work in lending, and many of my coworkers, who claim to have CS degrees, do not understand floats at all.
GP isn't just saying "don't use floats", though. (And even that is only a heuristic: It's possible to get correct results using floats, but you need to be very diligent about when and how you round, so in practice it's easiest to just avoid it.)
They're saying that only arbitrary precision arithmetics are acceptable, and additionally claiming that everybody else in the world gets money arithmetics wrong.
I doubt both of these statements, and especially the assertion that there's exactly one "correct" way of doing arithmetics with money.
Arbitrary precision decimals are the best solution in most cases. I have worked at multiple companies where people represent currency with floats and then wonder why they get strange results in some cases.
