def current_version(self, tuple_values):
		if tuple_values is None:
			self._current_version = None
			return
		elif type(tuple_values) is not tuple:
			try:
				tuple(tuple_values)
			except:
				raise ValueError(
					"current_version must be a tuple of integers")
		for i in tuple_values:
			if type(i) is not int:
				raise ValueError(
					"current_version must be a tuple of integers")
		self._current_version = tuple(tuple_values)