/**
 * The keys of a map keyed by an enum (labels, counts ...), typed:
 * `Record<T, ...>` has exactly the keys `T`, so this is the one place that
 * assertion is made - callers need no `Object.keys(...) as T[]` cast.
 */
export function keysOf<T extends string>(record: Readonly<Record<T, unknown>>): T[] {
  return Object.keys(record) as T[];
}