The Postprocessors of BeanDefinitionRegistry are not priority sorted

Hi,

I was going through the source code of AbstractApplicationContext in 3.1.0.RELEASE version of spring. In the invokeBeanFactoryPostProcessors method , the post processors of the BeanDefinitionRegistry are not priority ordered. I think this could be a potential bug, as Atleast when executing the spring batch application, PropertyPlaceHolderConfigurers which are supposed to be priority ordered are post processors of BeanDefinitionRegistry.