Exponential functions not accurate

[isXander]

ease in exp is the red line. as you can see, the line does not actually cross 0,0.

With the (x === 0 ? 0 : ...) this would make a noticeable jump

Futhermore, ease out exp also has the issue on the other end. the blue line being ease out exp

[isXander]

as you can see with the if, there is a noticeable jump