Stepped transitions using round values only

Are you trying to get a stepping action between two keyframes? For example, zero opacity at the start of a layer, then 100% at 4 seconds, but you want the opacity to change to 25% at 1 second 50% at 2, then 75% at 3, you could round the time value so time would always be a whole number, then multiply that number by 25. Something like this:

t = time - inPoint;
v = Math.floor(t);
v * 25

It would help if we knew exactly what you were trying to accomplish.

I guess that would be

Math.round(value)

for one-dimensional properties

[Math.round(value[0]),Math.round(value[1])]

for two-dimensional properties, etc.