With round() you can pick the number of digits after the decimal to round to, i.e. round(x, 2) to round to the nearest hundredth.

But floor() and ceiling() only work for going to an integer, not tenths or hundredths, etc.

They could use a similar optional second parameter like Round() has, that does the same thing.

i.e. while round(1.666, 2) would give 1.67, floor(1.666, 2) would give 1.66.

Without that, people have to resort to the workaround of multiplying by a power of ten to shift the decimal point, then calling floor() then shifting it back, like so:
to get the effect of floor(x, 2) the script has to do: floor(x*100) / 100.