We use the Angle type alias to represent angles. It is an alias, not a new type, so using the math package doesn't become a pain. The alias still allows us to attach documentation to the type, however.

When working with user-controllable angles, which includes all angles stored in exported fields or passed as function arguments, make sure to use normalizeAngle or clampAngle on them (depending if they represent a position or an amount of rotation), unless the surrounding math or logic already handles out-of-range values.

Also normalize and clamp angles in constructor-esque functions, so out of range values are less likely to make it to the user.