diff --git a/unum/vendor/golang.org/x/net/ipv6/doc.go b/unum/vendor/golang.org/x/net/ipv6/doc.go
new file mode 100644
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+++ b/unum/vendor/golang.org/x/net/ipv6/doc.go
@@ -0,0 +1,243 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package ipv6 implements IP-level socket options for the Internet
+// Protocol version 6.
+//
+// The package provides IP-level socket options that allow
+// manipulation of IPv6 facilities.
+//
+// The IPv6 protocol is defined in RFC 8200.
+// Socket interface extensions are defined in RFC 3493, RFC 3542 and
+// RFC 3678.
+// MLDv1 and MLDv2 are defined in RFC 2710 and RFC 3810.
+// Source-specific multicast is defined in RFC 4607.
+//
+// On Darwin, this package requires OS X Mavericks version 10.9 or
+// above, or equivalent.
+//
+//
+// Unicasting
+//
+// The options for unicasting are available for net.TCPConn,
+// net.UDPConn and net.IPConn which are created as network connections
+// that use the IPv6 transport. When a single TCP connection carrying
+// a data flow of multiple packets needs to indicate the flow is
+// important, Conn is used to set the traffic class field on the IPv6
+// header for each packet.
+//
+//	ln, err := net.Listen("tcp6", "[::]:1024")
+//	if err != nil {
+//		// error handling
+//	}
+//	defer ln.Close()
+//	for {
+//		c, err := ln.Accept()
+//		if err != nil {
+//			// error handling
+//		}
+//		go func(c net.Conn) {
+//			defer c.Close()
+//
+// The outgoing packets will be labeled DiffServ assured forwarding
+// class 1 low drop precedence, known as AF11 packets.
+//
+//			if err := ipv6.NewConn(c).SetTrafficClass(0x28); err != nil {
+//				// error handling
+//			}
+//			if _, err := c.Write(data); err != nil {
+//				// error handling
+//			}
+//		}(c)
+//	}
+//
+//
+// Multicasting
+//
+// The options for multicasting are available for net.UDPConn and
+// net.IPconn which are created as network connections that use the
+// IPv6 transport. A few network facilities must be prepared before
+// you begin multicasting, at a minimum joining network interfaces and
+// multicast groups.
+//
+//	en0, err := net.InterfaceByName("en0")
+//	if err != nil {
+//		// error handling
+//	}
+//	en1, err := net.InterfaceByIndex(911)
+//	if err != nil {
+//		// error handling
+//	}
+//	group := net.ParseIP("ff02::114")
+//
+// First, an application listens to an appropriate address with an
+// appropriate service port.
+//
+//	c, err := net.ListenPacket("udp6", "[::]:1024")
+//	if err != nil {
+//		// error handling
+//	}
+//	defer c.Close()
+//
+// Second, the application joins multicast groups, starts listening to
+// the groups on the specified network interfaces. Note that the
+// service port for transport layer protocol does not matter with this
+// operation as joining groups affects only network and link layer
+// protocols, such as IPv6 and Ethernet.
+//
+//	p := ipv6.NewPacketConn(c)
+//	if err := p.JoinGroup(en0, &net.UDPAddr{IP: group}); err != nil {
+//		// error handling
+//	}
+//	if err := p.JoinGroup(en1, &net.UDPAddr{IP: group}); err != nil {
+//		// error handling
+//	}
+//
+// The application might set per packet control message transmissions
+// between the protocol stack within the kernel. When the application
+// needs a destination address on an incoming packet,
+// SetControlMessage of PacketConn is used to enable control message
+// transmissions.
+//
+//	if err := p.SetControlMessage(ipv6.FlagDst, true); err != nil {
+//		// error handling
+//	}
+//
+// The application could identify whether the received packets are
+// of interest by using the control message that contains the
+// destination address of the received packet.
+//
+//	b := make([]byte, 1500)
+//	for {
+//		n, rcm, src, err := p.ReadFrom(b)
+//		if err != nil {
+//			// error handling
+//		}
+//		if rcm.Dst.IsMulticast() {
+//			if rcm.Dst.Equal(group) {
+//				// joined group, do something
+//			} else {
+//				// unknown group, discard
+//				continue
+//			}
+//		}
+//
+// The application can also send both unicast and multicast packets.
+//
+//		p.SetTrafficClass(0x0)
+//		p.SetHopLimit(16)
+//		if _, err := p.WriteTo(data[:n], nil, src); err != nil {
+//			// error handling
+//		}
+//		dst := &net.UDPAddr{IP: group, Port: 1024}
+//		wcm := ipv6.ControlMessage{TrafficClass: 0xe0, HopLimit: 1}
+//		for _, ifi := range []*net.Interface{en0, en1} {
+//			wcm.IfIndex = ifi.Index
+//			if _, err := p.WriteTo(data[:n], &wcm, dst); err != nil {
+//				// error handling
+//			}
+//		}
+//	}
+//
+//
+// More multicasting
+//
+// An application that uses PacketConn may join multiple multicast
+// groups. For example, a UDP listener with port 1024 might join two
+// different groups across over two different network interfaces by
+// using:
+//
+//	c, err := net.ListenPacket("udp6", "[::]:1024")
+//	if err != nil {
+//		// error handling
+//	}
+//	defer c.Close()
+//	p := ipv6.NewPacketConn(c)
+//	if err := p.JoinGroup(en0, &net.UDPAddr{IP: net.ParseIP("ff02::1:114")}); err != nil {
+//		// error handling
+//	}
+//	if err := p.JoinGroup(en0, &net.UDPAddr{IP: net.ParseIP("ff02::2:114")}); err != nil {
+//		// error handling
+//	}
+//	if err := p.JoinGroup(en1, &net.UDPAddr{IP: net.ParseIP("ff02::2:114")}); err != nil {
+//		// error handling
+//	}
+//
+// It is possible for multiple UDP listeners that listen on the same
+// UDP port to join the same multicast group. The net package will
+// provide a socket that listens to a wildcard address with reusable
+// UDP port when an appropriate multicast address prefix is passed to
+// the net.ListenPacket or net.ListenUDP.
+//
+//	c1, err := net.ListenPacket("udp6", "[ff02::]:1024")
+//	if err != nil {
+//		// error handling
+//	}
+//	defer c1.Close()
+//	c2, err := net.ListenPacket("udp6", "[ff02::]:1024")
+//	if err != nil {
+//		// error handling
+//	}
+//	defer c2.Close()
+//	p1 := ipv6.NewPacketConn(c1)
+//	if err := p1.JoinGroup(en0, &net.UDPAddr{IP: net.ParseIP("ff02::114")}); err != nil {
+//		// error handling
+//	}
+//	p2 := ipv6.NewPacketConn(c2)
+//	if err := p2.JoinGroup(en0, &net.UDPAddr{IP: net.ParseIP("ff02::114")}); err != nil {
+//		// error handling
+//	}
+//
+// Also it is possible for the application to leave or rejoin a
+// multicast group on the network interface.
+//
+//	if err := p.LeaveGroup(en0, &net.UDPAddr{IP: net.ParseIP("ff02::114")}); err != nil {
+//		// error handling
+//	}
+//	if err := p.JoinGroup(en0, &net.UDPAddr{IP: net.ParseIP("ff01::114")}); err != nil {
+//		// error handling
+//	}
+//
+//
+// Source-specific multicasting
+//
+// An application that uses PacketConn on MLDv2 supported platform is
+// able to join source-specific multicast groups.
+// The application may use JoinSourceSpecificGroup and
+// LeaveSourceSpecificGroup for the operation known as "include" mode,
+//
+//	ssmgroup := net.UDPAddr{IP: net.ParseIP("ff32::8000:9")}
+//	ssmsource := net.UDPAddr{IP: net.ParseIP("fe80::cafe")}
+//	if err := p.JoinSourceSpecificGroup(en0, &ssmgroup, &ssmsource); err != nil {
+//		// error handling
+//	}
+//	if err := p.LeaveSourceSpecificGroup(en0, &ssmgroup, &ssmsource); err != nil {
+//		// error handling
+//	}
+//
+// or JoinGroup, ExcludeSourceSpecificGroup,
+// IncludeSourceSpecificGroup and LeaveGroup for the operation known
+// as "exclude" mode.
+//
+//	exclsource := net.UDPAddr{IP: net.ParseIP("fe80::dead")}
+//	if err := p.JoinGroup(en0, &ssmgroup); err != nil {
+//		// error handling
+//	}
+//	if err := p.ExcludeSourceSpecificGroup(en0, &ssmgroup, &exclsource); err != nil {
+//		// error handling
+//	}
+//	if err := p.LeaveGroup(en0, &ssmgroup); err != nil {
+//		// error handling
+//	}
+//
+// Note that it depends on each platform implementation what happens
+// when an application which runs on MLDv2 unsupported platform uses
+// JoinSourceSpecificGroup and LeaveSourceSpecificGroup.
+// In general the platform tries to fall back to conversations using
+// MLDv1 and starts to listen to multicast traffic.
+// In the fallback case, ExcludeSourceSpecificGroup and
+// IncludeSourceSpecificGroup may return an error.
+package ipv6 // import "golang.org/x/net/ipv6"
+
+// BUG(mikio): This package is not implemented on NaCl and Plan 9.