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    has testdir => (
        traits => ['DirOption'],
...
        is => 'rw',
        rootdir => '/home/paulatreides',
    );

    has testdir => (
        traits => [ 'DirOption' => { rootdir => '/home/paulatreides' }
+ ],
        isa => 'Str',
        is => 'rw',
    );