static Map<S, O> dm_originalFieldValues(O mod) {
  mod = dm_getModule(mod);
  if (mod == null) null;
  O tempInstance = newInstance(mod.getClass());
  try {
    new Map<S, O> map;
    for (S field : allNonTransientNonStaticFields(mod))
      map.put(field, getOpt(tempInstance, field));
    ret map;
  } finally {
    cleanUp(tempInstance);
  }
}

Began life as a copy of #1024027