Method declaration is compatible but PHP complains

Question

So I have this class:

class JSObjectStorage extends \SplObjectStorage
{

    /**Adds a JavaScript object inside the storage, and optionally associate it to some data.*/    
    public function attach($javaScript, $data = null){}

    /**Removes the object from the storage.*/
    public function detach($javaScript){}

    /**Adds all objects-data pairs from a different JavaScriptBundle storage in the current storage.*/
    public function addAll(\SplObjectStorage $storage){}

    /**Removes objects contained in another storage from the current storage.*/
    public function removeAll(\SplObjectStorage $storage){}

    /**Removes all objects except for those contained in another storage from the current storage.*/
    public function removeAllExcept(\SplObjectStorage $storage){}

    /**Alias to JSObjectStorage::attach. */    
    public function offsetSet($javaScript, $data = null){}

    /**Alias to JSObjectStorage::detach*/
    public function offsetUnset($javaScript){}

    /**Returns the data associated with an object in the storage.*/
    public function offsetGet($javaScript){}

    /**This method calculates an identifier for the objects added to JSObjectStorage object.*/
    public function getHash($javaScript){}
}

and this is the SplObjectStorage:

http://php.net/manual/en/class.splobjectstorage.php

As you can see they are identical but when I instantiate JSObjectSTorage, I get the following error:

Strict standards: Declaration of MOWAFW\Core\Type\JavaScript\JSObjectStorage::addAll() should be compatible with that of SplObjectStorage::addAll() in /Users/**/JSObjectStorage.php on line 175

And this happens to removeAll() and removeAllExcept().

Any ideas?!

---

I'm using:

PHP 5.3.10 with Suhosin-Patch (cli) (built: Feb 20 2012 22:55:53) 
Copyright (c) 1997-2012 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2012 Zend Technologies
    with Xdebug v2.1.2, Copyright (c) 2002-2011, by Derick Rethans

Answer 1

Someone posted a bug report entitled "Namespace interfaces not working due to type hinting issues" (Bug #40653), which looks like your case despite the PHP version difference (it reads v. < 5.3.7).