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package Moo::Role::DBIConnection {
    use Moo::Role;
...
    use Types::DBI;
    has dbh => (is => 'ro', isa => Dbh, required => 1, coerce => 1);
};

package Moo::Role::DBIConnection {
    use Moo::Role;
...
        coerce     => 1,
    );
};