identity-ed25519 is undocumented
On reflection suspect you'd rather #16227 (moved) to be specifically about documenting future expansion. Spec 228 doesn't include a proposal for what would be added to the dir-spec. As such controllers like Stem, metrics-lib, and BridgeDB don't have a clear description on how they should be parsing this new content.
Happy to review it when we have a proposed spec addition.