def include?(value)
      if value.is_a?(::Range)
        # 1...10 includes 1..9 but it does not include 1..10.
        # 1..10 includes 1...11 but it does not include 1...12.
        operator = exclude_end? && !value.exclude_end? ? :< : :<=
        value_max = !exclude_end? && value.exclude_end? ? value.max : value.last
        super(value.first) && value_max.send(operator, last)
      else
        super
      end
    end
def include?(value)
      if value.is_a?(::Range)
        # 1...10 includes 1..9 but it does not include 1..10.
        # 1..10 includes 1...11 but it does not include 1...12.
        operator = exclude_end? && !value.exclude_end? ? :< : :<=
        value_max = !exclude_end? && value.exclude_end? ? value.max : value.last
        super(value.first) && value_max.send(operator, last)
      else
        super
      end
    end
Extends the default Range#=== to support range comparisons.
  (1..5) === (1..5)  # => true
  (1..5) === (2..3)  # => true
  (1..5) === (1...6) # => true
  (1..5) === (2..6)  # => false

 The native Range#=== behavior is untouched.
  ('a'..'f') === ('c') # => true
  (5..9) === (11) # => false
 Extends the default Range#include? to support range comparisons.
  (1..5).include?(1..5)  # => true
  (1..5).include?(2..3)  # => true
  (1..5).include?(1...6) # => true
  (1..5).include?(2..6)  # => false

 The native Range#include? behavior is untouched.
  ('a'..'f').include?('c') # => true
  (5..9).include?(11) # => false