code: def deserialize(self, value, **kwargs):
          
          kwargs.update({'trusted': kwargs.get('trusted', False)})
          if self.deserializer is not None:
              return self.deserializer(value, **kwargs)
          if value is None:
              return None
          return self.wrapper(value).astype(self.dtype[0])
docs: De-serialize the property value from JSON
  
          If no deserializer has been registered, this converts the value
          to the wrapper class with given dtype.