docs: def json(self, json_string=None):
          """
              Convenience method allowing easy dumping to and loading from json.
          """
          if json_string is not None:
              return self.__init__(loads(json_string))
          dump = self
          if isinstance(self, HAR.log):
              dump = {"log": dump}
          return dumps(dump, default=lambda x: dict(x))