Shouldn't "WHEN (OLD.* IS DISTINCT FROM NEW.*)" clause be independent from data type?

[pinker <pinker@xxxxxxx>]

I've tried to write audit trigger which fires only when data changed, so I used "WHEN (OLD.* IS DISTINCT FROM NEW.*)" clause as described in documentation. Should this clause be independent from data type? because an error occurs when I'm trying to modify row with point data type: 

ERROR:  could not identify an equality operator for type point

Example:
CREATE TABLE IF NOT EXISTS test1
(
  col1 POINT
)
WITH (
OIDS =FALSE
);

INSERT INTO test1 VALUES ('(0,1)');

CREATE OR REPLACE FUNCTION test_update()
  RETURNS TRIGGER AS
  $BODY$
  BEGIN

    RETURN NEW;

  END;
  $BODY$
LANGUAGE plpgsql VOLATILE
COST 100;

CREATE TRIGGER trigger_update_test
AFTER UPDATE
ON test1
FOR EACH ROW
WHEN ((old.* IS DISTINCT FROM new.*))
EXECUTE PROCEDURE test_update();

UPDATE test1 SET col1 = '(9,0)';

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