Hello, author here. Didn't expect to see this on hacker news after so many years :)

For you hardcore easers, @blurspline made some improved values by scripting tons of variants. Probably the way I should have done it, but I was in a rush to get it out before anyone else and never revisited it. http://www.lab4games.net/zz85/blog/2014/12/26/better-cubic-b...