> a small proportion of uses might result in a disproportionate amount of bugs. This is what concerns me. Sure, using decimal floating point solves 0.1 + 0.2 =

> a small proportion of uses might result in a disproportionate amount of bugs. This is what concerns me. Sure, using decimal floating point solves 0.1 + 0.2 = 0.3 (which I can't imagine ever writing in real code). But if you get used to that, then you start to expect 0.1*x + 0.2*x to be 0.3*x, and depending what x is this may or may not be true. Maybe it works for all of your test cases (because your test cases are things like 2 and 10^-4), but then you accept some user input and start getting weird bugs (or infinite loops). There is no good solution besides expecting and preparing for rounding error.