Remove fallback again

Author: gnoack

stdlib/2/itertools.pyi

@@ -84,9 +84,8 @@ def izip(iter1: Iterable[_T1], iter2: Iterable[_T2],
          iter3: Iterable[_T3], iter4: Iterable[_T4],
          iter5: Iterable[_T5], iter6: Iterable[_T6]) -> Iterator[Tuple[_T1, _T2, _T3,
                                                                  _T4, _T5, _T6]]: ...
-@overload
-def izip(*iter: Iterable[Any]) -> Iterator[tuple]: ...
-# TODO izip loses type information for 6 arguments and more
+# TODO more than 6 iterables
+# TODO should have a fallback for the n-ary variant
 
 def izip_longest(*p: Iterable[Any],
                  fillvalue: Any = ...) -> Iterator[Any]: ...