Re: [w3c/webcomponents] How to avoid memory leaks when detecting custom elements? (#674)

This this is not good then (even if it is just how Promises work). Can we make it cancellable?

```js
ce.whenDefined(...).then(...).cancel() // or something
```

When a parent component unmounts (disconnectedCallback) it'd be nice to cancel waiting on promises so the component can be cleaned up.

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