# File lib/dnsruby/resource/NXT.rb, line 238
    def assert_legal_bitmap_value(number)
      max_value = NxtTypes::MAX_BITMAP_NUMBER_VALUE
      if number > max_value
        raise ArgumentError.new("Bitmap maximum value is #{max_value} (0x#{max_value.to_s(16)}).")
      end
      if number & 1 == 1
        raise ArgumentError.new("Bitmap number must not have low bit set.")
      end
    end