docs: def extend(self, *array_list):
  		""" Concatenate this array with the given arrays. This method doesn't modify current array. Instead,
  		it creates new one, that have all of arrays. (see :meth:`.WBinArray.concat` method)
  
  		:param array_list: list of WBinArray
  		:return: newly created WBinArray
  		"""
  		result = WBinArray(int(self), len(self))
  		for array in array_list:
  			result = result.concat(array)
  		return result