Re: [heycam/webidl] More fixes for observable array type (#1006)

@EdgarChen commented on this pull request.



>  
 Similar to [=sequence types=] and [=frozen array types=], observable array types wrap around
 ECMAScript array types, imposing additional semantics on their usage.
 
+Observable array types are non-nullable, but T may be nullable.

Yeah, I saw the same sentence is used for promise types, so I added this.
But I think you are right. And the nullable type section already mentions inner type could not be an observable array type, it should be clear enough.

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