docs: def timedelta_div(first: datetime.timedelta,
                    second: datetime.timedelta) -> Optional[float]:
      """Implement divison for timedelta instances.
  
      :param first: First timedelta instance.
      :param second: Second timedelta instance.
      """
      first_seconds = timedelta_seconds(first)
      second_seconds = timedelta_seconds(second)
  
      if not second_seconds:
          return None
  
      return first_seconds / second_seconds