Re: [w3c/webcomponents] [idea] Make use of `observedAttributes` optional (#565)

> extending a super class's observedAttributes then becomes tricky

if really needed, there are ways.

```js
class MyElement extends HTMLElement {
  static get observedAttributes() {
    return new RegExp("^my-el-|" + super.observedAttributes().source);
  }
}
```

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