included

# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 6
        def self.included(base) #:nodoc:
          base.extend ClassMethods

          base.class_eval do
            alias_method :plus_without_duration, :+
            alias_method :+, :plus_with_duration
            
            alias_method :minus_without_duration, :-
            alias_method :-, :minus_with_duration
            
            alias_method :minus_without_coercion, :-
            alias_method :-, :minus_with_coercion
            
            alias_method :compare_without_coercion, :<=>
            alias_method :<=>, :compare_with_coercion
          end
        end