Re: [heycam/webidl] Allow dictionary default values to reference type members (#717)

@annevk review is most welcome!

The main issue we have is that some values in WebGPU are bitmasks, which don't translate terribly well to JS and WebIDL. Using dictionaries instead would be equally weird:

```
stateDescriptor.writeMask = { red: true, blue: true, alpha: true };
```

... which is what I think you're suggesting. Although that example isn't too bad, what happens with:

```
stateDescriptor.writeMask = { red: false, all: true };
```

With bitmasks there is a logical answer. With dictionaries you'd have to refer to the specification.

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