let compare_key: key => key => int;let is_empty: t('a) => bool;let mem: t('a) => key => bool;let to_sorted_array: t('a) => array((key, 'a));let to_sorted_array_with_f: t('a) => (key => 'a => 'b) => array('b);let add: t('a) => key => 'a => t('a);let adjust: t('a) => key => (option('a) => 'a) => t('a);let singleton: key => 'a => t('a);let remove: t('a) => key => t('a);let disjoint_merge: t('a) => t('a) => (key => 'a => 'a => 'a) => t('a);let disjoint_merge_exn: t('a) => t('a) => (key => 'a => 'a => exn) => t('a);let iter: t('a) => (key => 'a => unit) => unit;let fold: t('a) => 'b => (key => 'a => 'b => 'b) => 'b;let for_all: t('a) => (key => 'a => bool) => bool;let exists: t('a) => (key => 'a => bool) => bool;let cardinal: t('a) => int;let bindings: t('a) => list((key, 'a));let keys: t('a) => list(key);let find_exn: t('a) => key => 'a;let find_opt: t('a) => key => option('a);let find_default: t('a) => key => 'a => 'a;let map: t('a) => ('a => 'b) => t('b);let mapi: t('a) => (key => 'a => 'b) => t('b);let of_list: list((key, 'a)) => t('a);let of_array: array((key, 'a)) => t('a);let add_list: list((key, 'b)) => t('b) => t('b);