The lack of true arrays or vectors haven’t been an issue for me across a couple of domains. Of course maps can always be used as indexed based lookups for mid-s

The lack of true arrays or vectors haven’t been an issue for me across a couple of domains. Of course maps can always be used as indexed based lookups for mid-sized problems (similar to lua’s combined array/map type). What problems have you been facing where it’s an issue? It’d be nice to know to avoid said problems upfront.