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has alarmMailsTo => (
    traits => ['ConfigEmail'],    # trait for type "email"
...
    isa => 'ArrayRef[Str]',
    is => 'rw',
);

..
with My::Config;
...
    is => 'rw',
);
..

..
role My::Config {
...
    }
    ..
}

..
role My::Config::ConfigEmail {
...
    }
    ..
}