PSA::Request::CGI is one CPAN module that does multipart/form-data decoding without relying on any external modules, other than Class::Tangram (which is itself somewhat large, but is only being used as an accessor generator).

$h=$ENV{HOME};my@q=split/\n\n/,`cat $h/.quotes`;$s="$h/."
."signature";$t=`cat $s`;print$t,"\n",$q[rand($#q)],"\n";
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