To be fair: Rounding probably falls in the category of “operate on a float”, but rounding is certainly more common for “view” related logic than arithmetic.
I was recently looking into a php based money handling library using floats and round(float, precision) and was wondering how I could bring the point across that floats are not really a great for money, but couldn’t find a way to break it. Interestingly enough in php round does work like expected with floats: round(round(2.675, 2)) == float(2.68). Now I’m even more curious.
