func TestDoubleDecoding(t *testing.T) {
	client, err := mongo.Connect(...)
	require.NoError(t, err)

	defer func() {
		err := client.Disconnect(context.Background())
		require.NoError(t, err)
	}()

	coll := client.Database("test").Collection("test")

	type Data struct {
		Content []interface{} `bson:"content"`
	}

	doc := Data{
		Content: []interface{}{1, 2, 3},
	}

	_, err = coll.InsertOne(context.Background(), doc)
	if err != nil {
		t.Fatalf("InsertOne failed: %v", err)
	}

	t.Run("case1", func(t *testing.T) {
		result := Data{
			Content: []interface{}{7, 8, 9},
		}
		err = coll.FindOne(context.Background(), bson.D{}).Decode(&result)
		if err != nil {
			t.Fatalf("FindOne failed: %v", err)
		}

		t.Log(result)
	})
	t.Run("case2", func(t *testing.T) {
		v := 7
		result := Data{
			Content: []interface{}{&v},
		}
		err = coll.FindOne(context.Background(), bson.D{}).Decode(&result)
		if err != nil {
			t.Fatalf("FindOne failed: %v", err)
		}

		t.Log(result)
	})
}