Added defaults option

 <?php
+/*
+ * I made a boo boo
+ * This only works with Array variables
+ */
 class WP_Option implements ArrayAccess, Countable {
     private $_ns;
     private $_data = Array();
 
-    public function __construct($ns) {
+    public function __construct($ns, $defaults = null) {
         $this->_ns   = $ns;
         $this->_data = get_option($ns);
+
+        if (!is_null($defaults) && is_array($defaults)) {
+            foreach ($this->_data as $key => $val) {
+                $defaults[$key] = $val;
+            }
+
+            if ($this->_data != $defaults) {
+                $this->_data = $defaults;
+                $this->save();
+            }
+        }
     }
 
     public function offsetExists($var) {