// checks only non-transient, non-primitive fields
sclass MTSH_nonTransientFields implements MetaTransformer.StructureHandler {
  swappable bool shouldLookInto(O o) { true; }
  //swappable O cloneEmptyObject(O o) { unimplemented(); }
  
  /*public O transform(O o, IF1 recurse) {
    throw unimplemented();
  }*/
    
  public void visit(O o, IVF1 recurse) {
    if (shouldLookInto(o))
      for (Field f : nonStaticNonPrimitiveNonTransientFieldObjects_cachedArray(o))
        recurse.get(getField(f, o));
  }
}

Began life as a copy of #1031054