In the example below, a + b may overflow even though the division that comes later would prevent it. This particular case can be prevented by doing (a & b) + (a ^ b) / b. There are other functions with similar issues. See this library for ways of doing math without this sort of issue.
https://github.com/code-423n4/2022-04-backd/blob/c856714a50437cb33240a5964b63687c9876275b/backd/libraries/ScaledMath.sol#L40-L42
