> Like I said before, I am all for dropping extra fields we can not
> interpret.  However,
> let us be clear that with respect to the standard we are implementing
> that zip files > constructed like this are ill-formed.

I would still like to see the zipfile module to be able to detect 
ill-formed zipfiles - certainly not by default. This can be useful
to check zipfiles that somebody produces. As the Python check wouldn't
be complete, one would certainly need to apply other checks as well.