message: chore: tweak style and lint
diff: @@ -36,7 +36,7 @@ export default class WeakMap<K extends object, V> {
  }
  has(key: K): boolean {
  - return (this._guard(key) as any)[this._id];
  + return !!(this._guard(key) as any)[this._id];
  }
  protected _guard(key: K): K {
  