Re: [heycam/webidl] Need pattern for feature detecting dictionary members (#107)

> Ouch, if that can be arbitrary side effects then I'd rather avoid it.

Yeah, consider

```js
const shareOptions = {
  get title() {
    console.log("foo");
    return "title";
  }
};

if (navigator.share.supports(shareOptions)) { // will log
  navigator.share(shareOptions); // will log again
}
```

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