Mod does not correctly consider units

[TarVK]

Currently the mod operator ignores all units on the RHS, this is not correct.
Consider the following case:

1.01km mod 100meters

This would currently output 1.01km. Instead, these are the steps that should've been taken:

1.01km mod 100meters = 1.01km mod 0.1km = 0.01km

So unit conversion should be taking place, just like with subtraction. Modulo essentially represents: if I repeatedly subtract the RHS, what is the last value before getting a negative number. So it makes sense that units should be converted in the same way as with subtraction.