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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _as_json_dumps(self, indent: str=' ', **kwargs) -> str: """ Convert to a stringified json object. This is the same as _as_json with the exception that it isn't :param indent: indent argument to dumps :param kwargs: other arguments for dumps :return: JSON formatted string """

        return json.dumps(self, default=self._default, indent=indent, **kwargs)