Well, I have indeed spent more time thinking about this than is probably healthy, but here are some nice edge cases to think about: - https://github.com/JuliaL

Well, I have indeed spent more time thinking about this than is probably healthy, but here are some nice edge cases to think about: - https://github.com/JuliaLang/julia/issues/14826 https://github.com/JuliaLang/julia/issues/14826 mod(-eps(), 4.0) - https://github.com/JuliaLang/julia/issues/17415 https://github.com/JuliaLang/julia/issues/17415 fld(1.0,0.2) - https://github.com/JuliaLang/julia/issues/3127 https://github.com/JuliaLang/julia/issues/3127 mod(1.0,0.1) - https://github.com/JuliaLang/julia/issues/3104 https://github.com/JuliaLang/julia/issues/3104 mod(0.95,0.01) I'm pretty sure there are more issues. re: mod 2pi, typically it is most accurate to reduce to (-pi,pi) (i.e. division rounding to nearest). Also to get it accurate you need fancy range reduction algorithms, hence julia has rem2pi https://docs.julialang.org/en/stable/base/math/#Base.Math.rem2pi https://docs.julialang.org/en/stable/base/math/#Base.Math.re...