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

@TimothyGu 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.

Actually, I see the same sentence is used for promise types. Consider this optional then.

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