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According to the TouchEvents version 1 spec (http://www.w3.org/TR/touch-events/), document.createTouchList should support two forms:
TouchList createTouchList (Touch touches);
TouchList createTouchList (Touch touch);
Instead, WebKit takes a variable number of Touch parameters (supporting only the 2nd form), not the array form. We should also add support for the Array form in order to conform to the spec.
The specification has been changed to match the implementation, see http://www.w3.org/2010/webevents/track/issues/27. Mozilla will continue to support the array form, but there's probably not much value in doing so in WebKit.