Re: [ambient-light] What illuminance value should be reported for stopped sensor?

> However, spec doesn't specify what happens if developer caches 
reading and accesses it after stop is called.

Why would it? I would expect JavaScript semantics: 

```js
let raw = 1;
let reading = {
  get illuminance() {
    return raw;
  }
};

let als = {
  reading
};

let cached = als.reading;

console.log(cached.illuminance); // 1

als.reading = null;

console.log(cached.illuminance); // 1
```

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