radio inputs and disabled method

For radio inputs, disabled method is always returning false (meaning 
"enabled"), even if all radio inputs are disabled.
I think it should return something like: false if at least one radio 
with same name is not disabled...; true otherwise.

Also when we try to enable the radio, and then modify the input->value, 
we don't succeed.
I think it would be better if the method input->disabled(...) would 
enable/disable all radio buttons whithin the input..

I'm using libwww-perl-5.803...

Sample code:

    use HTML::Form;

    my $f = HTML::Form->parse(<<EOT, "http://www.example.com");
    <form>
    <input type=radio name=r0 value=1 disabled>one
    <input type=radio name=r0 value=2 disabled>two
    </form>
    EOT
    # here we see radio as not disabled
    print $f->dump;
    # try to enable it
    $f->find_input("r0")->disabled(0);
    # then we get the exception: The value '1' has been disabled for
    field 'r0' at
    $f->value("r0", 1);


Has anyone had similar feeling/experience or am I missing something ?