compare allows candidate-only MAAD rows for an IP version the reference has no MAAD rows for, so a pre-IPv6 reference no longer fails. verify --require-maad-data requires IPv6 MAAD rows when IPv6 traffic exists in the window, and verify-web requests every MAAD route with ipVersion=6. The web accepts only the literal ipVersion strings 4 and 6. The conformance doc notes that IPv6 nearly-full pruning is inert at the default range and drops a stale reference to the new head; a redundant route test is removed.