Re: [heycam/webidl] `record<unsigned short, ...` (#978)

JS syntax permits “bare” number tokens without expression-enclosing brackets and bare strings without quotes if they are valid identifiers, but both are effectively shorthand — an ES property key is a string or symbol and any other value gets coerced:

```js
const o = ({ [{ toString: () => '1' }]: 'hello', [2n]: 'world' });
-> {1: "hello", 2: "world"}

[ Reflect.ownKeys(o)[0], typeof Reflect.ownKeys(o)[0] ];
-> [ "1", "string" ]
```

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