Make1
is for blitting between two values of the same polymorphic type.
val blit : ('a t, 'a t) Base__.Blit_intf.blit
val blito : ('a t, 'a t) Base__.Blit_intf.blito
val unsafe_blit : ('a t, 'a t) Base__.Blit_intf.blit
val sub : ('a t, 'a t) Base__.Blit_intf.sub
val subo : ('a t, 'a t) Base__.Blit_intf.subo