e4x duplicate xmlns attributes

Hello,

I'm trying to parse an XML content containing multiple namespaces with 
E4X. Walking through the XML has the side-effect of creating duplicates 
namespaces :


var doc = <a xmlns='http://example.org/1'>
             <b xmlns='http://example.org/2'>
               <c xml:base="http://example.net/feed" type="html">
                 Foo <p>Bar</p> Foobar
               </c>
             </b>
           </a>;

doc[0].*::b[0]
> <b xmlns="http://example.org/2" xmlns="http://example.org/1">
>   <c xml:base="http://example.net/feed" type="html">
>     Foo <p>Bar</p> Foobar
>   </c>
> </b>

doc[0].*::b[0].*::c[0]
> <c xml:base="http://example.net/feed" type="html" xmlns="http://example.org/2" xmlns="http://example.org/1">
>   Foo <p>Bar</p> Foobar
> </c>

doc[0].*::b[0].*::c[0].*::*
> Foo <p xmlns="http://example.org/2" xmlns="http://example.org/1">Bar</p> Foobar


Version: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.0.6) 
Gecko/2009020911 Ubuntu/8.10 (intrepid) Firefox/3.0.6

Is this a bug ?

-- 
kael