I'm guessing you're missing
http://search.cpan.org/dist/CGI.pm/lib/CGI.pm#FORM_ELEMENTS
-override
A boolean, which, if true, forces the element to take on the value specified by -value, overriding the sticky behavior described earlier for the -nosticky pragma.
print hidden(-name => "Old" . $param , -value => $value, -override => 1);

In reply to Re^4: CGI: which field has changed? by Anonymous Monk
in thread CGI: which field has changed? by davies

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