T : sig ... endval validate_lbound : min:t Base.Maybe_bound.t ‑> t Base.Validate.checkval validate_ubound : max:t Base.Maybe_bound.t ‑> t Base.Validate.checkval validate_bound : min:t Base.Maybe_bound.t ‑> max:t Base.Maybe_bound.t ‑> t Base.Validate.check