Re: [w3c/webcomponents] CSS Modules (#759)

Why would you do that, rather than just getting/setting `document.adoptedStylesheets` in each function?

Also, note that this is a consequence of `await` semantics in argument position; they're a little unobvious and should generally be avoided. (Basically, all preceding arguments are eagerly evaluated before the function pauses.) If you wrote those functions as:

```js
async function addB() {
  const newVal = await resolveAfter('c', 50);
  arr = [...arr, newVal];
}
```

...you'd be just fine and it would work as expected, with arr being `['a', 'c', 'b']` at the end.

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