Or we can make programming languages that do not require flattening by hand. Off-by-ones are easy to make in both systems. Also it’s annoying that standard libr

Or we can make programming languages that do not require flattening by hand. Off-by-ones are easy to make in both systems. Also it’s annoying that standard libraries do not include functions like n_ints_inclusive(from, to), range_of_last_n_or_less(arr_size, n), n_elems_before(range, n), index_after_range(range), flatten2(i, j, stride) and so on. As if PL designers wanted us to draw ranges on paper and visually check our reasoning every time we have to deal with indices.