Encoding Invariants
convertRoundTripAToB never fails.
Test: Encoding.t.sol#L76
Asserts that a raw versioned nonce can be encoded / decoded to reach the same raw value.
convertRoundTripBToA never fails.
Test: Encoding.t.sol#L87
Asserts that an encoded versioned nonce can always be decoded / re-encoded to reach the same encoded value.