no warnings 'uninitialized';
if (!!(my $num = $recFono->field_as_text('102') +
    !!(my $type = $recFono->field_as_text('104')) {
    something();
}

##</code><code>##

my $num = $recFono->field_as_text('102');
my $type = $recFono->field_as_text('104');
if ($num || $type) {
    something();
}