Re: [webauthn] Should an RP be able to provide finer grained authenticator filtering in attestation options? (#1688)

I would have thought you could indicate this with:

```
navigator.credentials.get({
  publicKey: {
    challenge: new Uint8Array([/* bytes sent from the server */]),
    authenticatorSelection: {
      "authenticatorAttachment": "platform"
      "userVerification": "preferred"
    }
  }
})
```

Note both the placement of `userVerification` and `authenticatorAttachment` are within `authenticatorSelection`.

With this clarification, is your use case satisfied by the current specifications?

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