@@ -51,14 +51,6 @@ export default class Collection {
this._itemMap = new Map();
/**
- * Next id which will be assigned to unidentified item while adding it to the collection.
- *
- * @private
- * @property
- */
- this._nextId = 0;
-
- /**
* The name of the property which is considered to identify an item.
*
* @private