anchor.diff:  = nng_pair(7)
   //
  -// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
  +// Copyright 2020 Staysail Systems, Inc. <info@staysail.tech>
   // Copyright 2018 Capitar IT Group BV <info@capitar.com>
   //
   // This document is supplied under the terms of the MIT License, a
  
positive.code: Normally, this pattern will block when attempting to send a message if
  no peer is able to receive the message.
  
  NOTE: Even though this mode may appear to be "reliable", because back-pressure
  prevents discarding messages most of the time, there are topologies involving
  _devices_ (see xref:nng_device.3.adoc[`nng_device()`]) or raw mode sockets
  (see xref:nng_options.5.adoc#NNG_OPT_RAW[`NNG_OPT_RAW`]) where
  
negative.code: 
  Version 1 of the protocol offers improved protection against loops when
  used with xref:nng_device.3.adoc[`nng_device()`].
  
  NOTE: Version 1 of this protocol is considered experimental at this time.
  
  === Polyamorous Mode
  
  CAUTION: Polyamorous mode was provided as an experiment, and that experiment
  is deemed to have failed.
  Thus use of this mode is discouraged.
  In particular, the design cannot function over
  xref:nng_device.3.adoc[device] proxies.
  Consequently, this mode may be removed in a future release.
  
  Normally pair sockets are for one-to-one communication, and a given peer
  will reject new connections if it already has an active connection to another
  