docs: def set_attribute_option(self, attribute, option_name, option_value):
          """
          Sets the given attribute option to the given value for the specified
          attribute.
          """
          self.__validate_attribute_option_name(option_name)
          attribute_key = self.__make_key(attribute)
          mp_options = self.__attribute_options.setdefault(attribute_key, {})
          mp_options[option_name] = option_value