"select ... where field like lower('%text%')" fails

Sean Kelly (lists(at)shortestpath(dot)org) reports a bug with a severity of 1
The lower the number the more severe it is.

Short Description
"select ... where field like lower('%text%')" fails

Long Description
I am trying to search a varchar(x) field with a query like "select ... where field like lower('%someText%')".

In one field, if the value someText is at the very start then the search fails. In another field, if the value someText is at the very start then the search succeeds.

[See code - note results where 0 rows are returned]

Sample Code
isp=> \d user_tbl
Table "user_tbl"
Attribute | Type | Modifier
-----------+-------------+-------------------------
username | varchar(10) | not null
company | varchar(80) | not null
email | varchar(80) |
password | varchar(20) | not null
active | boolean | not null default 'TRUE'
created | timestamp | not null
Index: user_tbl_pkey

isp=> SELECT username,company,active,created from user_tbl where username = 'sean';
username | company | active | created
----------+---------------------+--------+------------------------
sean | Sean's Test Company | t | 2001-01-14 14:01:58+00
(1 row)

isp=> SELECT username,company,active,created from user_tbl where username like lower('%SEaN%');
username | company | active | created
----------+---------------------+--------+------------------------
sean | Sean's Test Company | t | 2001-01-14 14:01:58+00
(1 row)

isp=> SELECT username,company,active,created from user_tbl where company like lower('%SEaN%');
username | company | active | created
----------+---------+--------+---------
(0 rows)

isp=> SELECT username,company,active,created from user_tbl where company like lower('SEaN%');
username | company | active | created
----------+---------+--------+---------
(0 rows)

isp=> SELECT username,company,active,created from user_tbl where company like lower('%EaN%');
username | company | active | created
----------+---------------------+--------+------------------------
sean | Sean's Test Company | t | 2001-01-14 14:01:58+00
(1 row)

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