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Returns the length of the stack, i.e. how many layers deep it currently is.

=back

=head1 SEE ALSO

L<Tie::Hash::Stack>

L<Data::StackedHash>

=head1 BUGS AND LIMITATIONS

Please report any bugs or feature requests to C<bug-data-stackedmap@rt.cpan.org>, 
or through the web interface at L<http://rt.cpan.org>.

=head1 AUTHOR

Claes Jakobsson C<< <claesjac@cpan.org> >>

=head1 LICENCE AND COPYRIGHT