code: def to_int(b:Any)->Union[int,List[int]]:
      "Convert `b` to an int or list of ints (if `is_listy`); raises exception if not convertible"
      if is_listy(b): return [to_int(x) for x in b]
      else:          return int(bf to_int(b:Any)->Union[int,List[int]]:
      "Convert `b` to an int or list of ints (if `is_listy`); raises exception if not convertible"
      if is_listy(b): return [to_int(x) for x in b]
      else:          return int(b)
docs: Convert `b` to an int or list of ints (if `is_listy`); raises exception if not convertible