[Web Speech API] Speech utterance example missing "new" keyword, and what should be the return value of the constructor when called as a function?

Speech utterance example missing "new" keyword.
https://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html#examples-synthesis

> speechSynthesis.speak(SpeechSynthesisUtterance('Hello World'));


should be:

> speechSynthesis.speak(new SpeechSynthesisUtterance('Hello World'));

As it is currently written, it will throw a ~"constructor is not a function" error in WebKit. 

The working group might wish to consider if you want the constructor to return a value when called without the new keyword. For example, Date() returns a string value for the current datetime, or a Date object if prefixed with the “new" keyword. 

> Date()
"Wed Apr 03 2013 16:40:46 GMT-0700 (PDT)"
> new Date()
Wed Apr 03 2013 16:40:46 GMT-0700 (PDT)

> typeof Date()
string
> typeof new Date()
object

I’d lean toward making SpeechSynthesisUtteranceConstructor constructor, when called as a function, return a SpeechSynthesisUtteranceConstructor instance (effectively making the new keyword optional) but I don’t believe the current spec allows this. I may be wrong.

Thanks,
James Craig