Audiosprite allowMultiple property doesn't exist?

[producerism]

In the Phaser example pages, they all show a property called allowMultiple, for example:

fx = game.add.audioSprite('sfx');
fx.allowMultiple = true;

However viewing the actual source of AudioSprite.js, there is no allowMultiple property. The allowMultiple property is part of the Sound class, meaning that the correct way seems to be this:

fx = game.add.audioSprite('sfx');
fx.sounds['sound_id_1'].allowMultiple = true;

Was the API changed at some point, or are the examples wrong?