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sub _create_package {
    ...
    $self->_write_worksheet_files();
...
        croak "Couldn't create sub directory $dir: $!";
    }
}

sub new {
    my $class = shift;
...

    $self->{_tempdir} = $dir;
}

sub _store_workbook {
    ...
...
    $packager->_create_package();
    ...
}