anchor.diff:  -----
   
   
  -GC Principles: References Count
  --------------------------------
  +(Too) simple solution: References Counting
  +------------------------------------------
   
   ...
   
  
positive.code: * less frequent collections
  * [line-through]+Mark and Copy+, objects are moved around to minimize fragmentation:
  ** +Mark+
  ** +Deleted+
  ** +Compact+
  * much slower
  
  
negative.code: . Mark all _the rest_ as garbage
  
  
  (Too) simple solution: References Counting
  ------------------------------------------
  
  Counting the references to an object may easily be automated.
  (E.g. Python prior v2)
  
  [graphviz,,fdp]
  -----
  