easeInOutCubic constant Null safety
The result is a safe sweet spot when choosing a curve for a widget whose initial and final positions are both within the viewport.
Compared to Curves.easeInOutQuad, this curve is slightly steeper.
Derived from Robert Penner’s easing functions.
static const Cubic easeInOutCubic = Cubic(0.645, 0.045, 0.355, 1.0);