message: perf(hash): access sorted keys
diff: @@ -58,7 +58,7 @@ export class Case<T, K extends PropertyKey = never>
  get [St.hashSym](): number {
  let h = h0
  - for (const k of Object.keys(this).sort()) {
  + for (const k of this.#keys) {
  h = St.combineHash(h, St.hash(this[k]))
  }
  return h
  