svoid setDynTransient(O o, S field, O value) ctex {
  if (o == null || field == null) ret;
  Field f = fieldObject(o, field);
  if (f != null) {
    f.set(o, value);
    if (isTransient(f))
      ret;
    else if (!o instanceof DynamicObject)
      fail("Can't make field transient: " + f);
  }
  
  if (o cast DynamicObject) {
    dynamicObject_setRawFieldValue(o, field, value);
    addToPersistenceInfo(o, field, false);
  } else
    fail("Field not found in " + className(o) + ": " + field);
}