I work webmail on @jaos software . incoming (input) are emails

I thought this little preview of code

package CGI::as_utf8;
BEGIN {
    use strict;
    use warnings;
    use CGI 3.47;  # earlier versions have a UTF-8 double-decoding bug
    {
        no warnings 'redefine';
        my $param_org = \&CGI::param;
        my $might_decode = sub {
            my $p = shift;
            # make sure upload() filehandles are not modified
            return $p if !$p || ( ref $p && fileno($p) );
            utf8::decode($p);  # may fail, but only logs an error
            $p
        };
        *CGI::param = sub {
            # setting a param goes through the original interface
            goto &$param_org if scalar @_ != 2;
            my $q = $_[0];    # assume object calls always
            my $p = $_[1];
            return wantarray
                ? map { $might_decode->($_) } $q->$param_org($p)
                : $might_decode->( $q->$param_org($p) );
        }
    }
}
1
[download]

but I must be careful in the webmail there is of course the posibility to upload. consider how the thing

or else , : either. I can afford to encode the file handle as quoted above