`sig
val collate : string -> string -> int
val unescaped : ?strict:bool -> string -> string
val unescaped_res :
?strict:bool -> string -> (string, int * string) Core.Std.Result.t
val squeeze : string -> string
val is_substring_deprecated : substring:string -> string -> bool
val pad_left : ?char:char -> string -> int -> string
val pad_right : ?char:char -> string -> int -> string
val line_break : len:int -> string -> string list
val word_wrap :
?trailing_nl:bool ->
?soft_limit:int -> ?hard_limit:int -> ?nl:string -> string -> string
val edit_distance : ?transpose:unit -> string -> string -> int
end`