Re: [w3c/IndexedDB] Allow expressions in addition to keyPaths when creating indexes (#33)

This looks pretty fun :)

Looks like result of an index can only be primitives + array + binary? 

Is it possible for a index to have multiple types? I.e.
```js
registerIndexExpression('foo', r => { return r.bool ? r.str : r.arrayType });
```

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