Method keys

lib/util/LazySet.js:216–220

* Returns the key iterator, eagerly materializing pending merges first. * @returns {SetIterator<T>} keys

()

	 * @returns {SetIterator<T>} keys
	 */
	keys() {
		this._deopt = true;
		if (this._needMerge) this._merge();
		return this._set.keys();
	}

	/**
	 * Returns the value iterator, eagerly materializing pending merges first.