type ('k, 'v, 'cmp) t
= ('k, 'v, 'cmp) Incr_map.Make(Incr).Lookup.t
val create : ?data_equal:('v ‑> 'v ‑> bool) ‑> ('k, 'v, 'cmp) Core_kernel.Map.t Incr.t ‑> comparator:('k, 'cmp) Core_kernel.Comparator.t ‑> ('k, 'v, 'cmp) t
val find : ('k, 'v, 'a) t ‑> 'k ‑> 'v option Incr.t
module For_debug : sig ... end