docs: def easeInOutBack(n, s=1.70158):
      """A "back-in" tween function that overshoots both the start and destination.
  
      Args:
        n (float): The time progress, starting at 0.0 and ending at 1.0.
  
      Returns:
        (float) The line progress, starting at 0.0 and ending at 1.0. Suitable for passing to getPointOnLine().
      """
      _checkRange(n)
      n = n * 2
      if n < 1:
          s *= 1.525
          return 0.5 * (n * n * ((s + 1) * n - s))
      else:
          n -= 2
          s *= 1.525
          return 0.5 * (n * n * ((s + 1) * n + s) + 2)