diff --git a/tinygrad/shape/view.py b/tinygrad/shape/view.py
index 2a05519a94..9c78af3ae1 100644
--- a/tinygrad/shape/view.py
+++ b/tinygrad/shape/view.py
@@ -1,7 +1,7 @@
 from __future__ import annotations
 import functools, operator, itertools, math
 from dataclasses import dataclass
-from typing import Tuple, List, Optional, Dict, Set, cast
+from typing import Tuple, List, Optional, Dict, Set, cast, Sequence
 from tinygrad.dtype import dtypes
 from tinygrad.ops import resolve, UOp, Variable, sint, sym_infer, smax, smin, sint_to_uop
 from tinygrad.helpers import prod, all_int, argsort, flatten, ceildiv
@@ -95,10 +95,11 @@ class View:
                  for x in self.shape+self.strides+(self.offset,)+(tuple(flatten(self.mask)) if self.mask is not None else tuple()))
   def __lt__(self, o:View): return self.t < o.t
 
-  def to_indexed_uops(self:View, _idxs:Optional[List[UOp]|Tuple[UOp, ...]]=None, vexpr:UOp=UOp.const(dtypes.bool, True)) -> Tuple[UOp, UOp]:
-    idxs = [UOp.range(dtypes.int, 0, s, i) for i,s in enumerate(self.shape)] if _idxs is None else _idxs
+  def to_indexed_uops(self:View, idxs:Optional[Sequence[UOp]]=None, vexpr:UOp=UOp.const(dtypes.bool, True)) -> Tuple[UOp, UOp]:
+    """(idx, valid)"""
+    if idxs is None: idxs = [UOp.range(dtypes.int, 0, s, i) for i,s in enumerate(self.shape)]
     iexpr = sint_to_uop(self.offset)
-    for idx,sh,st,m in zip(idxs, self.shape, self.strides, self.mask if self.mask is not None else [None]*len(self.shape)):
+    for idx,sh,st,m in zip(idxs, self.shape, self.strides, self.mask if self.mask is not None else itertools.repeat(None)):
       if resolve(sh != 1) and resolve(st != 0): iexpr = iexpr + idx*st
       if m is not None:
         if resolve(m[0] != 0): vexpr = vexpr * (idx >= m[0])