Why does AudioListener boost my volume using values over 1 when the documentation says its normalized between 0.0 and 1.0?

I am running this script:

void Awake()
{
AudioListener.volume = 10f;
}

and the volume does increase. The gain is too much after 30-40. This is super helpful since i dont have to increase the volume on my audio assets externally but is it stable or is something weird going on? I am on unity 4.6 beta and im using both 2d and 3d sounds.

This is perfectly fine. Think of the audio like an image: It would be pretty useless if it could only scale down.