// keeps package names for dynamic code (package dyn.*)
sS shortDynClassNameForStructure(O o) {
   if (o instanceof DynamicObject && ((DynamicObject) o).className != null)
    ret ((DynamicObject) o).className;
  if (o == null) null;
  Class c = o instanceof Class ? (Class) o : o.getClass();
  S name = c.getName();
  ret name.startsWith("dyn.") ? classNameToVM(name) : shortenClassName(name);
}