/** Component-memory only. Identical retries retain their key; every changed submission gets a new one. */
export function retryIdentity() {
  let previous: string | undefined
  let key: string
  return (payload: unknown): string => {
    const next = JSON.stringify(payload)
    if (next !== previous) {
      previous = next
      key = crypto.randomUUID()
    }
    return key
  }
}