https://metacpan.org/pod/CGI::FormBuilder#How-do-I-manually-override-the-value-of-a-field 
$form->field(type => 'hidden', name => 'hiddn', value=>'', force=>1);

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In reply to Re: Hidden variable in cgi formbuilder by Anonymous Monk
in thread Hidden variable in cgi formbuilder by PiyaPerl

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