Animation Interpolation Type

[PierreJasmin_REVisionEffects]

One thing we never pushed to github is allowing an effect to set parameter interpolation type (with net result that we have even seen animated option menu get linearly interpolated).

I think it can be done simply and be useful
For example glTF has 3 types for animation channels:  Step, Linear and Cubic

I actually personally don't care if it's in some app splines, bezier or whatever curve function and the implementation is locally different from an app to the other for animation curves (with or not handles, with control functions like ease-in even all host domain specific ok)  etc but I think we need a 4th type: monotonic (no over - under shoot like cubic spline interpolant) which also has different names and implementation (I guess similar to Continuous Bezier in AE), 

https://en.wikipedia.org/wiki/Monotone_cubic_interpolation

Anyone has some thoughts on this?

Pierre