Method has

lib/util/LazySet.js:207–210

* Checks whether an item is present after applying any deferred merges. * @param {T} item an item * @returns {boolean} true, when the item is in the Set

(item)

	 * @returns {boolean} true, when the item is in the Set
	 */
	has(item) {
		if (this._needMerge) this._merge();
		return this._set.has(item);
	}

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