input: 
  def squared_list(numbers: List[int]) -> List[int]:
      """ Compute the squared values of a given list of integers.
      >>> squared_list([1, 2, 3, 5, 8, 13])
      [1, 4, 9, 25, 64, 169]
      """
  
output:     return [x ** 2 for x in numbers]