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: = nng_pair(7)
  //
  // Copyright 2018 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
  
negative.code: message using the xref:nng_msg_get_pipe.3.adoc[`nng_msg_get_pipe()`] function,
  such as when replying to an incoming message.
  
  NOTE: This capability _only_ works with directly connected peers.
  It is not possible to use polyamorous mode in the presence of proxies.
  
  In order to prevent head-of-line blocking, if the peer on the given pipe
  is not able to receive (or the pipe is no longer available, such as if the
  peer has disconnected), then the message will be discarded with no notification
  