fetch_internal(cmd, set, attr) private

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# File lib/net/imap.rb, line 1223
    def fetch_internal(cmd, set, attr)
      if attr.instance_of?(String)
        attr = RawData.new(attr)
      end
      synchronize do
        @responses.delete("FETCH")
        send_command(cmd, MessageSet.new(set), attr)
        return @responses.delete("FETCH")
      end
    end
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