symfony/symfony — pull request #3437 by Seldaek (2012-02-23 19:07:12+00:00)
Title: [HttpKernel] Remove the _controller since it is not a route parameter part of the URL

There is no reason for the _controller to be there, the whole idea behind this _route_params thing was to help re-generating the current page's URL, you can easily grab the _route + _route_params and reconstruct it without having lots of garbage as query parameters like `?_controller=Foo::..`