Getting Yii to play nice with PHP 5.3 namespaces

I have been struggling with using PHP 5.3 namespaces with Yii. The Yii autoloader is passed the namespace AND the class name, so it is not seeing \foo\bar\class as an imported class.

I have tried creating my own autoloader and registered it using Yii::registerAutoloader(), but for some reason the Yii autoloader is running first some of the time.

If anyone has solved the problem, or knows of a strategy that works, I would appreciate it if you would share it with me.