write_ipaddr

# File activesupport/lib/active_support/message_pack/extensions.rb, line 230
      def write_ipaddr(ipaddr, packer)
        if ipaddr.prefix < 32 || (ipaddr.ipv6? && ipaddr.prefix < 128)
          packer.write("#{ipaddr}/#{ipaddr.prefix}")
        else
          packer.write(ipaddr.to_s)
        end
      end