Error on creating new TouchEvent using emulated touch event

[IanBellomy]

Attempting to create a new TouchEvent using the provided Event as a TouchEventInit dictionary results in an error:

ex.

document.body.addEventListener("touchstart",(e)=>{			
    document.body.dispatchEvent(new TouchEvent("touchmove",e))
})		

... Failed to construct 'TouchEvent': Failed to convert value to 'Touch'....

I think this is expected based on the described test failures, but this may be a not-uncommon use case, so I thought I'd log it.