Bring back foreach int indexes

[Siarhei Siamashka]

On Thursday, 30 November 2023 at 21:28:51 UTC, Steven 
Schveighoffer wrote:
> Honestly, maybe the easiest fix here is just to fix the actual 
> lowering to be more sensical (I would have expected 270 
> iterations with repeated indexes 0 to 13 after going through 
> 255).

Or maybe a runtime error, similar to how out-of-bounds array 
accesses are handled would be more reasonable here?