sO mapMethodLike dm_originalFieldValue(S field, O mod) {
  mod = dm_getModule(mod);
  if (mod == null) null;
  O tempInstance = newInstance(mod.getClass());
  try {
    ret getOpt(tempInstance, field);
  } finally {
    cleanUp(tempInstance);
  }
}

Began life as a copy of #1023947