Re: [IndexedDB] Introduce IDBKeySet (#19)

Noodling:

```webidl

// valid?
typedef (unrestricted double or Date or DOMString or BufferSource or sequence<IDBKey>) IDBKey;

// old:
typedef (IDBKey or IDBKeyRange) IDBQuery;

// new ???
```

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https://github.com/w3c/IndexedDB/issues/19#issuecomment-112535950