The get_verification_result method returns a VerificationResult, which contains two sets of TUF keyids.

Typical usage of a VerificationResult entails retrieving the Key objects for those keyids from the corresponding root metadata keystore. It would be useful, if VerificationResult included Key objects right away.

Options are:

1. Use sets of Key objects - This requires making the Key class hashable and immutable, which is possible but maybe overly complicated (see discussion))
2. Use lists of Key objects and promise that they only contain unique keys, and optionally provide tooling for set-like operations (see wrapper workaround)
3. Use "keyid: Key"- dictionaries (see wrapper workaround)