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Classes can implement a method "void $transformer()".
This method is called on every object whose class was redefined and can therefore be used to initialize the new instances of a class.
Additionally, it is possible to implement a static method "void $staticTransformer()" that will be called on the class only.
Example code:

class A {
  int x;
}

class A' {
  int x;
  int doubleX;

  static void $staticTransformer() {
    System.out.println("Class A has a new version");
  }

  void $transformer() {
    doubleX = 2 * x;
  }
}

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