Indexable.String_foldableval iter : ('a Indexable0_to_N(String).elt -> unit) -> 'a Indexable0_to_N(String).t -> unitval iteri : (int -> 'a Indexable0_to_N(String).elt -> unit) -> 'a Indexable0_to_N(String).t -> unitval fold_left : ('acc -> 'a Indexable0_to_N(String).elt -> 'acc) -> 'acc -> 'a Indexable0_to_N(String).t -> 'accval exists : ('a Indexable0_to_N(String).elt -> bool) -> 'a Indexable0_to_N(String).t -> boolval for_all : ('a Indexable0_to_N(String).elt -> bool) -> 'a Indexable0_to_N(String).t -> boolval is_empty : 'a Indexable0_to_N(String).t -> bool