That is not what they mean by “magic”. The “magic” in xz is the complexity in the build system. Here, the “magic” are seemingly arbitrary numbers that improve p

That is not what they mean by “magic”. The “magic” in xz is the complexity in the build system. Here, the “magic” are seemingly arbitrary numbers that improve performance. The reason they’re magic is because we don’t know why they were chosen. The code itself is obvious and not magic.