Select Code to Download

sub option {
    my ($self, $key, $value) = @_;
...
        $self->{options}->{$key} = $value :
        $self->{options}->{$key};
}

@hash{ map $array[$_], grep !($_ & 1), 0 .. $#array } = map $array[$_]
+, grep $_ & 1, 0 .. $#array;

sub merge_hash {
    my ($hash, $array) = @_;
    @$hash{ map $array->[$_], grep !($_ & 1), 0 .. $#{$array} } = map 
+$array->[$_], grep $_ & 1, 0 .. $#{$array};
}

sub merge_hash (\%\@) {
## rest unchanged
}