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class Range
  # Extends the default Range#include? to support range comparisons.
  # (1..5).include?(1..5) # => true
  # (1..5).include?(2..3) # => true
  # (1..5).include?(2..6) # => false
  #
  # The native Range#include? behavior is untouched.
  # ("a".."f").include?("c") # => true
  # (5..9).include?(11) # => false
  def include_with_range?(value)
    if value.is_a?(::Range)
      # 1...10 includes 1..9 but it does not include 1..10.
      operator = exclude_end? && !value.exclude_end? ? :< : :<=
      include_without_range?(value.first) && value.last.send(operator, last)
    else
      include_without_range?(value)
    end
  end

  alias_method_chain :include?, :range
end
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