in_out_bounce

in_out_bounce(t: float) -> float

Bounce ease in-out - bounces at both start and end with smooth middle transition.

Combines bounce-in and bounce-out effects, creating complex motion that bounces at the beginning (building energy), smoothly transitions through the middle, then bounces at the end (settling into place). Maximum playful character. Mathematical form: Uses bounce-in for first half, bounce-out for second half Use cases: - Maximum impact transitions between major interface states - Game animations that need extra personality and fun - Celebration sequences that feel extra bouncy and joyful - Loading animations that entertain with complex bouncing - Special effect transitions that need to stand out - UI elements that should feel extremely playful and engaging Like a rubber ball in a pinball machine: bounces off the starting bumper, flies through the middle space, then bounces several times before settling in the target slot.