I have a problem with QueryInterface to base interfaces. It seems that 
pyxpcom does an unnecessary and maybe wrong re-wrapping of the object. 
The situation is that I have an implementation of nsIChannel in python. 
In the mozilla code a pointer to nsIChannel is cast to nsIRequest. Which 
is legal because nsIChannel derives from nsIRequest. With this new 
pointer to nsIRequest the mozilla code does an QueryInterface to 
nsIRequest and expects that it gets the same pointer but it gets a new 
one. See Assert_NoQueryNeeded in the mozilla code.

In the above case "nsIChannel-> QueryInterface( IID_nsIChannel ) == 
nsIChannel" as expected but "nsIRequest -> QueryInterface( IID_nsIRequest 
) != nsIRequest" which seems wrong to me and the check in 
Assert_NoQueryNeeded agrees with that. 
<http://lxr.mozilla.org/mozilla1.8/source/xpcom/glue/nsCOMPtr.h#589> 

Regards,
Sebastian



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