fetch(key, dv=@sentinel) public

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# File lib/drb/timeridconv.rb, line 29
      def fetch(key, dv=@sentinel)
        synchronize do 
          obj = peek(key)
          if obj == @sentinel
            return dv unless dv == @sentinel
            raise InvalidIndexError
          end
          @renew[key] = obj # KeepIt
          return obj
        end
      end
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