weird lower() problem with character

Hi,

it seems that something has changed in handling 'character' datatypes.

With 7.2.3 this worked fine, with 7.3.1 it does not work.

This is a test with varchar, and it works:
==============================================================
test=> create table test ( test varchar(200) );
CREATE TABLE
test=> insert into test values ('test(at)test(dot)com');
INSERT 12016215 1
test=> select * from test where test = lower('TEST(at)TEST(dot)COM');
test
---------------
test(at)test(dot)com
(1 row)
==============================================================

with 'character' it does not work anymore:
==============================================================
test=> create table test ( test character(200) );
CREATE TABLE
test=> insert into test values ('test(at)test(dot)com');
INSERT 12016228 1
test=> select * from test where test = lower('TEST(at)TEST(dot)COM');
test
------
(0 rows)
==============================================================

Comments? How can I fix that without converting to varchar?

Regards,
Bjoern