let add: t => elt => unit;let add_iter: t => ((elt => unit) => 'x => unit) => 'x => unit;let max_elt: t => option(elt);let get_max_elt: t => elt;let pop_max: t => option(elt);let remove_max: t => unit;let of_array: array(elt) => t;let of_list: list(elt) => t;let of_iter: ((elt => unit) => 'x => unit) => 'x => t;let iter_unordered: (elt => unit) => t => unit;let fold_unordered: ('acc => elt => 'acc) => 'acc => t => 'acc;