I guess its because at some point to determine uniqueness UNION has to call something like ST_Equals and since all the PostGIS relation functions are only supported for geometries with the same SRID it would fail.
Look like it:
select st_equals('srid=4326;point(3 3)'::geometry,
'srid=4325;point(3 3)'::geometry)
ERROR: Operation on mixed SRID geometries
So I would say this is a limitation of design rather than a bug.
I disagree. I think ST_EQUALS should return false here, not blow up. Charlie
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