Is it true that MERGE tables don't support geometric data types?

[todd hodes]

in mysql Ver 14.3 Distrib 4.1.1-alpha, for pc-linux (i686)

given

create table geo1 (
`id` int(11) NOT NULL auto_increment,
`location` linestring NOT NULL default '',
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;

create table geo2 (
`id` int(11) NOT NULL auto_increment,
`location` linestring NOT NULL default '',
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;

then

create table geomerge (
`id` int(11) NOT NULL auto_increment,
`location` linestring NOT NULL default '',
KEY (`id`)
) ENGINE=MERGE DEFAULT CHARSET=utf8;

gives

ERROR 1178 (42000): The storage engine for the table doesn't support GEOMETRY

Is this true, that MERGE doesn't support geometric data types?
or is there a flaw in my MERGE command?