anchor.diff:  delivers messages to receivers based on how quickly they settle the
   deliveries. Faster receivers get more messages.
   
  -===== Closest
  +==== Closest
   
   An anycast method in which even if there are more receivers for the
   same address, every message is sent along the shortest path to reach
  
positive.code: disposition regardless of whether the message was delivered to any
  consumers.
  
  ===== Balanced
  
  An anycast method which allows multiple receivers to use the same
  address. In this case, messages (or links) are routed to exactly one
  
negative.code: of topology cost. If there are multiple receivers with the same lowest
  cost, deliveries will be spread evenly among those receivers.
  
  ==== Multicast
  
  Having multiple consumers on the same address at the same time,
  messages are routed such that each consumer receives one copy of the
  