any value you keep, and unreference (unref) any value you receive.
can reuse the array when ((union alloc_header *)data)[-1].ref is zero.
，推荐阅读51吃瓜获取更多信息
Now the astronauts have arrived home, they will soon be taken to the Johnson Space Centre in Houston, Texas, where they will be checked over by medical experts.
I just learned about the Svalboard. I’m interested in it for the ergonomics and the magnetic switches. I’m all about a weird-looking keyboard, but I do feel it would be a downgrade in terms of aesthetics and elegance compared to the Voyager. I’m pondering taking that plunge.