Re: [w3c/IndexedDB] Allow multiEntry + Array keyPath (#36)

If we ever tackle this, we also need to specify the behavior when a subkey is missing, e.g.:

```js
store.createIndex('by_name', ['name', 'alias'], {multiEntry: true});
store.add({name: 'Luke Cage', nickname: 'Power Man'}); // OK; two entries
store.add({name: 'Jessica Jones'}); // ???
```

If multiEntry were false, this throws since `nickname` does not resolve and the compound key can't have a hole. But here it would be logical (?) for there to be only a single entry.

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