@classmethod
def _gen_json(cls, obj):
    """
		internal use generator for converting
		`json.JSONEncoder.iterencode <https://docs.python.org/3/library/json.html#json.JSONEncoder.iterencode>`_
		output to bytes
		"""
    for chunk in cls.json_encoder.iterencode(obj):
        yield chunk.encode('utf-8')
