docs: def parse_data_to_internal(self, include_custom=False):
          """
          Invoke parse_data_to_internal() for every element
          in self.data
          """
          for element in self.data:
              self.data[element].parse_data_to_internal()
          if include_custom:
              for element in self.custom_data:
                  self.custom_data[element].parse_data_to_internal()