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

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
<http://www.postgresql.org/docs/9.4/static/sql-createtrigger.html> . 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
VOLATILECOST 100;CREATE TRIGGER trigger_update_testAFTER UPDATEON test1FOR
EACH ROWWHEN ((old.* IS DISTINCT FROM new.*))EXECUTE PROCEDURE
test_update();UPDATE test1 SET col1 = '(9,0)';

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