fulltext search with utf8 characters (umlaut) with 5.1

[david halter]

The following FTS example seems not to work:
-----------------------------
CREATE TABLE IF NOT EXISTS `fullTextTable` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`name` varchar(80) CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL,
PRIMARY KEY (`id`),
FULLTEXT KEY `nameFull` (`name`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;

insert into `fullTextTable` (name) values('bärtsch'),('börtsch'),('böll'),('büll');

select * from `fullTextTable` where match(name) against('+bärtsch' in boolean mode);

drop table `fullTextTable`;
-----------------------------
Returns:
+----+----------+
| id | name |
+----+----------+
| 1 | bärtsch |
| 2 | börtsch |
| 3 | böll |
+----+----------+

Could anyone tell me, why FTS returns wrong words? This exists just in combination with umlauts (only tested the german umlauts).

It might also be a bug.

Cheers!
David