docs: def easeInOutQuad(n):
      """A quadratic tween function that accelerates, reaches the midpoint, and then decelerates.
  
      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)
      if n < 0.5:
          return 2 * n**2
      else:
          n = n * 2 - 1
          return -0.5 * (n*(n-2) - 1)