docs: def _get_specification_positions(self):
          """
          Returns a tuple with the start and end line numbers of the stored routine specification.
  
          :rtype: tuple
          """
          start = -1
          for (i, line) in enumerate(self._routine_source_code_lines):
              if self._is_start_of_stored_routine(line):
                  start = i
  
          end = -1
          for (i, line) in enumerate(self._routine_source_code_lines):
              if self._is_start_of_stored_routine_body(line):
                  end = i - 1
  
          return start, end