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Simple easing functions
All functions have the signature fn<F: Float>(F) -> F (letting you use f32, f64, or any other type that implements num_traits’s Float). Input should range from 0.0 to 1.0, and output is generally in the 0.0 to 1.0 range (except for elastic and back, which return values slightly outside). 0.0 always maps to 0.0, and 1.0 always maps to 1.0.