ampersand-Übergabe an Google-Formular durch Mechanize

[Beat]

if ($a->content() =~ m/Google/)
  {
  $a->submit_form("form_number" => "1",
       "fields" => {
"num"    => "100",
"as_epq" => "hut & mantel", #mit der genauen Wortgruppe
"as_qdr" => "w",
       },
"title" =>"Google-Suche"
);

Was sagt WWW::Mechanize bezüglich urlencoding der zu submittenden Daten?

mfg Beat