message: Fix timer leak in PromiseMemoizer
diff: @@ -94,6 +94,9 @@ export class PromiseMemoizer<T> implements IDisposable {
  public deleteMemoized = (...args: any[]) => {
  const key: string = this._generateKeyFn(...args);
  this._cachedPromises.delete(key);
  + const timer = this._timers.get(key);
  + if (timer)
  + clearTimeout(timer);
  };
  /** Clear all entries in the memoizer cache */
  