Module Maybe_bound.As_upper_bound
Compares t values as upper bounds, where Unbounded is highest, Incl x > Excl x, and other cases of Incl and/or Excl are compared based on 'a. If As_upper_bound.compare compare_a t1 t2 <= 0 and is_upper_bound t1 ~of_:a ~compare, then is_upper_bound t2 ~of_:a ~compare. For example, for int As_upper_bound.t:
... < Excl 13 < Incl 13 < Excl 14 < Incl 14 < ... < Unboundedtype nonrec 'a t= 'a t