Re: [w3c/IndexedDB] boolean should be a valid key (#76)

It could be a significant performance win if you had for example:

```typescript
{image:Blob, seen:boolean}
```

If you want to count how many images have been seen you have to clone them all and count manually, which is a pretty huge performance loss. I have this situation already, but fortunately the data is just strings rather than Blobs.

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