docs: def render(self, data, mimetype):
          """
          Serializes a Python object into a byte array containing a JSON document.
          :param data: A Python object.
          :param mimetype: The mimetype to render the data.
          :return: A byte array containing a JSON document.
          """
  
          indent = self.__get_indent(mimetype)
          encoding = mimetype.params.get('charset') or 'utf-8'
          return json.dumps(data, indent=indent).encode(encoding)