Puppet users - Mar 2014 - puppetlabs-mysql module still doesn't properly support $datadir?

It seems like this has been an issue in the past 
(https://github.com/puppetlabs/puppetlabs-mysql/issues/228,
https://groups.google.com/forum/#!searchin/puppet-users/mysql/puppet-users/mkQygmpa610/bXIslE9EG4cJ),
but I'm not sure its fixed yet. Can anyone show me some demonstration 
puppet code that will install MySQL and configure it to use /mnt/mysql 
instead of /var/lib/mysql? Nothing I seem to try works -- the MySQL daemon 
continues to start up and use /var/lib/mysql. 

The simplest thing that should have worked, I think, is:

node foo {
>   file { '/mnt/mysql':
>     ensure => directory,
>     owner => 'mysql',
>     group  => 'mysql',
>     notify => Class['mysql::server::service'];
>   }
>   class { '::mysql::server':
>     override_options => {
>       'mysqld' => { 'datadir' =>
'/mnt/mysql', },
>     },
>     require          => File[$datadir];
>   }
>   mysql::db { 'foo': }
> }

This did create the /mnt/mysql directory, but mysqld still started up using 
/var/lib/mysql... even though my.cnf clearly pointed to /mnt/mysql.

Ideas?

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