See https://buble.surge.sh/#%2F%2F%20works%0Afunction%20test%20(%7B%20a%20%3D%201%7D)%20%7B%7D%0A%0A%2F%2F%20compiles%2C%20but%20with%20incorrect%20result%0Afunction%20test%20(%7B%20a%20%3D%201%7D%20%3D%20%7B%7D)%20%7B%7D