code: def _sum_wrapper(fn):
      
  
      def wrapper(*args, **kwargs):
          v = 0
          new_args = _cast_args_to_list(args)
          for arg in zip(*new_args):
              v += fn(*arg, **kwargs)
          return v
  
      return wrapper
docs: Wrapper to perform row-wise aggregation of list arguments and pass
      them to a function.  The return value of the function is summed
      over the argument groups.  Non-list arguments will be
      automatically cast to a list.