vior is "track_selectively".  This means that class
  instances are tracked only if they are serialized through pointers anywhere in
  the program. Now multiple saves from the same address result in only the first one 
  being written to the archive. Subsequent saves only add the address - even though the 
  data might have been changed.  When it comes time to load the data, all instances of the log record show the same data.
  In this way, the behavior of a functioning piece of code is changed due the side