code: def post_dump(fn=None, pass_many=False, pass_original=False):
      
      return set_hook(fn, (POST_DUMP, pass_many), pass_original=pass_original)
docs: Register a method to invoke after serializing an object. The method
      receives the serialized object and returns the processed object.
  
      By default, receives a single object at a time, transparently handling the ``many``
      argument passed to the Schema. If ``pass_many=True``, the raw data
      (which may be a collection) and the value for ``many`` is passed.
  
      If ``pass_original=True``, the original data (before serializing) will be passed as
      an additional argument to the method.