code: public RedwoodConfiguration collapseApproximate(){
      tasks.add(new Runnable() { public void run() { Redwood.spliceHandler(VisibilityHandler.class, new RepeatedRecordHandler(RepeatedRecordHandler.APPROXIMATE),OutputHandler.class); } });
      return this;
    }
docs: Collapse repeated records, using an approximate notion of equality
  (i.e. records begin or end with the same substring)
  This is useful for cases such as tracking iterations ("iter 1" and "iter 2" are considered the same record).
  @return this