docs: def generator_name(cls):
  		""" :meth:`.WHashGeneratorProto.generator_name` implementation
  		"""
  		if cls.__generator_name__ is None:
  			raise ValueError('"__generator_name__" should be override in a derived class')
  		if isinstance(cls.__generator_name__, str) is False:
  			raise TypeError('"__generator_name__" should be a str instance')
  		return cls.__generator_name__.upper()