Unusual behaviour with intarray

Hi,

I am using intarray in contrib, and have seen some strange behaviour with
one of the operations. Anyone know whats going on here?

cabbage=# create table test (id int, writers int[]);
CREATE TABLE
cabbage=# insert into test values(1, '{}');
INSERT 1545023 1
cabbage=# select * from test;
id | writers
----+---------
1 | {}
(1 row)

cabbage=# update test set writers = (select writers - '{1}'::int[]);
UPDATE 1
cabbage=# select * from test;
id | writers
----+---------
1 | {}
(1 row)

cabbage=# update test set writers = (select writers - '{1}'::int[]);
UPDATE 1
cabbage=# select * from test;
id | writers
----+-----------
1 | {3044207}
(1 row)

Thanks for any help

Adam

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