Re: [heycam/webidl] Type association restrictions for extended attributes break with unions (#827)

And yes, we could try to move nullables over to union syntax, with the complication that `null` would not be a type you can ever really use standalone, presumably...  and it would still need to get exempted from this checking so people can do `[AllowShared] (BufferSource or null)` (which WebGL wants to do; they are doing `[AllowShared] BufferSource?` right now).

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