wrong release function in async example

找到包含 release(item) 函式的 async 範例，並檢查排隊中的請求如何接收已釋出的項目。驗證佇列交接以及 free/available 計數，然後執行該範例的 release 行為，以確認直接交給排隊使用者的項目不會同時被計為 free。

  release(item) {
    const index = this.items.indexOf(item);
    if (index < 0) throw new Error('Pool: release unexpected item');
    if (this.free[index]) throw new Error('Pool: release not captured');
    this.free[index] = true;
    this.available++;
    if (this.queue.length > 0) {
      const { resolve, timer } = this.queue.shift();
      clearTimeout(timer);
      if (resolve) setTimeout(resolve, 0, item);
    }
  }

error - we should not free released item if we resolve it for user in queue

  release(item) {
    const index = this.items.indexOf(item);
    if (index < 0) throw new Error('Pool: release unexpected item');
    if (this.free[index]) throw new Error('Pool: release not captured');
    if (this.queue.length > 0) {
      const { resolve, timer } = this.queue.shift();
      clearTimeout(timer);
      if (resolve) setTimeout(resolve, 0, item);
    } else { 
      this.free[index] = true;
      this.available++;
    }
  }