val (&&) : bool t -> bool t -> bool t
val (||) : bool t -> bool t -> bool t
val (+) : int t -> int t -> int t
val (-) : int t -> int t -> int t
val (*) : int t -> int t -> int t
val (/) : int t -> int t -> int t
val (+.) : float t -> float t -> float t
val (-.) : float t -> float t -> float t
val (*.) : float t -> float t -> float t
val (/.) : float t -> float t -> float t
val (**) : float t -> float t -> float t
val (?>) : 'a t -> ( 'a -> 'b t ) -> 'b t
module Pixel : sig ... end