> c.find().batchSize(2).explain()
Fri Apr 13 17:00:08 uncaught exception: error: {
	"$err" : "tailable cursor requested on non capped collection",
	"code" : 13051
}

         if ( argc > 9 && JSVAL_IS_NUMBER( argv[9] ) )
-            c.setProperty( obj , "_options" , argv[8] );
+            c.setProperty( obj , "_options" , argv[9] );
         else
             c.setProperty( obj , "_options" , JSVAL_ZERO );