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Six new String functions, all in OCaml syntax inside runtime.sx: iter : index-walk with side-effecting f iteri : iter with index fold_left : thread accumulator left-to-right fold_right: thread accumulator right-to-left to_seq : return a char list (lazy in real OCaml; eager here) of_seq : concat a char list back to a string Round-trip: String.of_seq (List.rev (String.to_seq "hello")) = "olleh" Note: real OCaml's Seq is lazy. We return a plain list because the existing stdlib already provides exhaustive list operations and we don't yet have lazy sequences. If a baseline needs Seq.unfold or similar, we'll graduate to a proper Seq module then.