docs: public static void marshallUUID(UUID uuid, ObjectOutput out, boolean checkNull) throws IOException {
        if (checkNull) {
           if (uuid == null) {
              out.writeBoolean(true);
              return;
           }
           out.writeBoolean(false);
        }
        out.writeLong(uuid.getMostSignificantBits());
        out.writeLong(uuid.getLeastSignificantBits());
     }