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Laravelにてidの値を取得できない

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Laravelのモデルidに文字列を使うとidを取得した際にidの値が0になる。

test_model
CREATE TABLE `test_model` (
  `id` varchar(5) NOT NULL,
  `user` varchar(10) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
COMMIT;

INSERT INTO `test_model`(`id`, `user`) VALUES ('id1','user1');

TestModelを作成

php artisan make:model TestModel
TestModel
class TestModel extends Model
{
    protected $table = 'test_model';
}
>>> $obj = TestModel::first();
=> App\Models\TestModel {
     id: "id1",
     user: "user1",
   }
>>> $obj->id;
=> 0

モデルに以下を追加するとidが正常に取得できる。

public $incrementing = false;

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