1. Non-spec-final features are always behind a flag.
2. Spec final requires two independent implementations which interoperate.
3. Then nostr:npub1e0z776cpe0gllgktjk54fuzv8pdfxmq6smsmh8xd7t8s7n474n9smk0txy needs to put in PR to make it on by default.
4. Then we need a release!