== Comparable#cap

  require 'facets/comparable/cap'

  3.cap(4).assert == 3
  4.cap(4).assert == 4
  5.cap(4).assert == 4

== Comparable#at_most

  3.at_most(4).assert == 3
  4.at_most(4).assert == 4
  5.at_most(4).assert == 4

== Comparable#at_least

  3.at_least(4).assert == 4
  4.at_least(4).assert == 4
  5.at_least(4).assert == 5