HTML::Form and <select multiple="">

Hi,

I noticed a change to HTML::Form::ListInput's add_to_form() method 
between versions 5.79 and 5.800 of libwww-perl (revisions 1.39 and 
1.44 of HTML/Form.pm) that I'm not sure was intentional.  Previously, 
a <select> tag like this:
  <select name="foo" multiple="">

was interpreted as a multiple select menu.  In the newer versions, it 
is not.  As far as I can tell from the HTML specs, that's illegal HTML 
(it should just be multiple, or multiple="multiple", or nothing).  But 
I think the old way that Form.pm interpreted it is more realistic, and 
it conforms with the way I've seen it work on a couple of browsers.
This would be a patch for Form.pm revision 1.49 (libwww-perl-5.803):

1009c1009
<     if ($type eq "option" && $self->{multiple}) {
---
>     if ($type eq "option" && exists $self->{multiple}) {

Apologies if this has already been discussed -- I just joined the list 
to put it out there.
Josh Rai