Ensure the User metacache is updated when a meta field is set

@@ -7,7 +7,7 @@ class User {
     public $id = 0;
 
     protected $_wpuser;
-    public $_metacache = Array(); // should be protected, need to figure out how invisible byte works with serialize and not using base64 encode
+    public $_metacache = []; // should be protected, need to figure out how invisible byte works with serialize and not using base64 encode
 
     public function __construct($id, $name = '', $blog_id = '') {
         $this->_wpuser = new WP_User($id, $name, $blog_id);
@@ -22,12 +22,20 @@ class User {
         return $this->getMeta($key, true);
     }
 
+    /**
+     * Magically set a meta value and persist it to the store.
+     *
+     * @param $key
+     * @param $val
+     */
     public function __set($key, $val) {
         $this->setMeta($key, $val);
+        // Update the meta cache
+        $this->_metacache[$key] = $val;
     }
 
     public function __sleep() {
-        return Array('_metacache', 'id', 'ID');
+        return ['_metacache', 'id', 'ID'];
     }
 
     public function __wakeup() {
@@ -46,7 +54,7 @@ class User {
     public function __call($method, $params) {
         if (method_exists($this->_wpuser, $method)) {
             $this->setUser();
-            return call_user_func_array(Array($this->_wpuser, $method), $params);
+            return call_user_func_array([$this->_wpuser, $method], $params);
         }
 
         $classname = get_class($this->_wpuser);