try tuple

Author: dcherian

src/zarr/testing/strategies.py

@@ -220,7 +220,7 @@ def orthogonal_indices(
         newshape = [1] * ndim
         newshape[axis] = idxr.size
         npindexer.append(idxr.reshape(newshape))
-    return tuple(zindexer), np.broadcast_arrays(*npindexer)
+    return tuple(zindexer), tuple(np.broadcast_arrays(*npindexer))
 
 
 def key_ranges(