https://stackoverflow.com/questions/75648798/how-can-i-serialize-a-scala-singleton-object

gistfile1.txt

$ scalac potato.scala 
$ ls
potato.class  potato$.class  potato.scala
$ javap -p  potato.class 
Compiled from "potato.scala"
public final class potato {
  public static void dirt_$eq(int);
  public static int dirt();
}
$ javap -p  potato\$.class 
Compiled from "potato.scala"
public final class potato$ implements scala.Serializable {
  public static potato$ MODULE$;
  private int dirt;
  public static {};
  public int dirt();
  public void dirt_$eq(int);
  private java.lang.Object readResolve();
  private potato$();
}