<> and != on geometry yield operator is not unique

[robe]

Reported on IRC someone trying to create a trigger with construct:

 (NEW.geom != OLD.geom) 

yielded != is not unique for geometry. had to resort to

 (NEW.geom::text != OLD.geom::text) 

I verified it is an issue with

SELECT ST_Point(1,2) != ST_Point(3,4);
SELECT ST_Point(1,2) <> ST_Point(3,4);

However this works fine:

SELECT ST_Point(1,2)::geography != ST_Point(3,4)::geography;
SELECT ST_Point(1,2)::geography <> ST_Point(3,4)::geography;

I haven't verified where the extra operator indirection is coming from that is not effecting geography as well.