message: Always check if the permalink is a spec permalink
  See code for rationale
diff: @@ -280,6 +280,9 @@ export function makeGroupPermalink(groupId) {
  }
  export function isPermalinkHost(host: string): boolean {
  + // Always check if the permalink is a spec permalink (callers are likely to call
  + // parsePermalink after this function).
  + if (new SpecPermalinkConstructor().isPermalinkHost(host)) return true;
  return getPermalinkConstructor().isPermalinkHost(host);
  }
  