Re: [w3c/webcomponents] The is="" attribute is confusing? Maybe we should encourage only ES6 class-based extension. (#509)

@justinfagnani decorators were a mistake to mention, if only because they are distracting from my core proposal: functions. In your case `WindowOrWorkGlobalScope` is a function that takes a constructor and I assume does something like `return class extends Object {};` internally, right?

FWIW decorators use the return value of functions, so you could rewrite this as:

```js
@WindowOrWorkerGlobalScope
class MyGlobalLikeThing {}
```

See http://codepen.io/treshugart/pen/zZOrYX?editors=1010 for an example of this with a custom element.

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