Python is a language that uses floats and doubles, like almost all of them. This can cause rounding problems for beginners and experience developers. When working on textual we have lots of cod which will divide the screen into various proportions. The great thing about fractions in the stan library is they don't suffer from that rounding error. So if you have m, you know, three one tenths, it'll add up to three tenths exactly with no no rounding error.