anchor.diff:     (`bool`, version 1 only)  This option enables the use of _polyamorous_ mode.
      The value is read-write, and takes an integer Boolean value.  The default
      false value (0) indicates that legacy monogamous mode should be used.
  +
  +NOTE: This option, and the associated capability are considered failed experiments.
  +Thus, use of it is discouraged, and it may be removed in a future release.
   
   xref:nng_options.5.adoc#NNG_OPT_MAXTTL[`NNG_OPT_MAXTTL`]::
   
  
positive.code: The ((_pair_ protocol)) implements a peer-to-peer pattern, where
  relationships between peers are one-to-one.
  
  Version 1 of this protocol supports an optional ((_polyamorous_ mode)) where a
  peer can maintain multiple partnerships.
  Using this mode requires some additional sophistication in the application.
  
  === Socket Operations
  
  The xref:nng_pair_open.3.adoc[`nng_pair_open()`] functions create a _pair_ socket.
  
negative.code: = nng_pair(7)
  //
  // 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
  