This class implements common easing functions. The math is pretty obscure, but this cool website has nice visual illustrations of what they represent: http://xaedes.de/dev/transitions/
A simple elastic interaction, similar to a spring. Default bounciness is 1, which overshoots a little bit once. 0 bounciness doesn't overshoot at all, and bounciness of N > 1 will overshoot about N times.
Runs an easing function backwards.
Makes any easing function symmetrical.
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