+<span id='Ext-util-MixedCollection-method-constructor'> /**
+</span> * Creates new MixedCollection.
+ * @param {Boolean} allowFunctions Specify <tt>true</tt> if the {@link #addAll}
+ * function should add function references to the collection. Defaults to
+ * <tt>false</tt>.
+ * @param {Function} keyFn A function that can accept an item of the type(s) stored in this MixedCollection
+ * and return the key value for that item. This is used when available to look up the key on items that
+ * were passed without an explicit key parameter to a MixedCollection method. Passing this parameter is
+ * equivalent to providing an implementation for the {@link #getKey} method.
+ */