The `rem`, `div` and `divrem` functions also all optionally take a rounding mode argument that lets you have the behavior that matches any rounding mode, where

The `rem`, `div` and `divrem` functions also all optionally take a rounding mode argument that lets you have the behavior that matches any rounding mode, where `RoundToZero` matches `div` and `RoundDown` matches `mod`, but there are actually a total of seven rounding modes. Most of them are pretty useless, but if you need some style of division and the remainder to match, this is very helpful.