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C<iterable_array> and for knowing the order of the items as they get added or
removed.

=cut
has 'stack' => (
        is => 'rw',
        isa => 'ArrayRef');

=item B<stack_hash>

The original hash, has all the elements with all their properties (eg extra
keys). The I<disadvantage> of it is that it doesn't keeps the order of the
elements, hence the need of C<stack>.

=cut
has 'stack_hash' => (
        is => 'ro',
        isa => 'HashRef[Str]');

=item B<iterable_array>