sub add_stuff_to_file {
    my ($filehandle, $stuff) = @_;
    ($stuff->isa('Iterable')) || die "Stuff must be iterable";
    my $i = $stuff->iterator();
    ($i->isa('Iterator')) || die "Stuff's iterator must be an Iterator";
    while ($i->hasNext()) { 
         print $filehandle $i->next();
    }
}

##</code><code>##

serialize_stuff_to_file(Array::Iterator->new(@array));
serialize_stuff_to_file(ArrayOfArrays::Iterator->new(@array));
serialize_stuff_to_file(ArrayOfHashes::Iterator->new(@array));
serialize_stuff_to_file(Hash::Iterator->new(%hash));
serialize_stuff_to_file(HashOfHashes::Iterator->new(%hash));
serialize_stuff_to_file(HashOfArrays::Iterator->new(%hash));
serialize_stuff_to_file(Tree::Iterator->new($tree));