If you've got bugs due to iteration order you have a whole other issue. If you know that iteration order is important, it should be explicit in the way you prep

If you've got bugs due to iteration order you have a whole other issue. If you know that iteration order is important, it should be explicit in the way you prepare/store/handle the data. If your code only works when you iterate in a specific order and you didn't deliberately define that order, it's only really working by accident. Don't get me wrong, it's actually a bug I've run into in the past, and you're right, the non-deterministic issue makes it harder to debug. But when I discovered it I blamed myself for not being explicit with my constraints.