mathlib3

4b6fcd90 - perf(data/gaussian_int): speed up div and mod (#1394)

perf(data/gaussian_int): speed up div and mod (#1394) avoid using `int.cast`, and use `rat.of_int`. This sped up `#eval (⟨1414,152⟩ : gaussian_int) % ⟨123,456⟩` from about 5 seconds to 2 milliseconds