docs: def represent_as_tuple(string):
      """
      Represent a number-string in the form of a tuple of digits.
      "868.0F" -> (8, 6, 8, '.', 0, 15)
  
      Args:
          string - Number represented as a string of digits.
      Returns:
          Number represented as an iterable container of digits
  
      >>> represent_as_tuple('868.0F')
      (8, 6, 8, '.', 0, 15)
      """
      keep = (".", "[", "]")
      return tuple(str_digit_to_int(c) if c not in keep else c for c in string)