lower() broken?

I have a record in table cust with the username of joblo and it's
already lower case. This is from a cvsup a couple of weeks old.

classifieds=> select count(*) from cust where username = lower('joblo');
count
-----
0
(1 row)

classifieds=> select count(*) from cust where username = 'joblo';
count
-----
1
(1 row)

Doesn't seem to matter if I use lower on username, 'joblo' or both. And
there's only the one record in the table.

Did something break or did I forget how to use lower()?

Vince.
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