sum(sign, time = ::Time.current) private

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# File activesupport/lib/active_support/duration.rb, line 480
      def sum(sign, time = ::Time.current)
        unless time.acts_like?(:time) || time.acts_like?(:date)
          raise ::ArgumentError, "expected a time or date, got #{time.inspect}"
        end

        if @parts.empty?
          time.since(sign * value)
        else
          @parts.inject(time) do |t, (type, number)|
            if type == :seconds
              t.since(sign * number)
            elsif type == :minutes
              t.since(sign * number * 60)
            elsif type == :hours
              t.since(sign * number * 3600)
            else
              t.advance(type => sign * number)
            end
          end
        end
      end
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