Isn't reference counting just a different style of garbage collection? I see lots of articles saying that swift both is and isn't garbage collected, and I'm curious what the proper answer is here.
```
struct Node {
var next: Node?
var prev: Node?var a = Node(next: nil, prev: nil)
let b = Node(next: nil, prev: a)
a.next = b
```
These two objects will persist in memory for the entire life of the app even when all reference to a and b are gone, except for their references to one another.
Reference counting is listed as a strategy to achieve garbage collection. Broadly speaking, garbage collection is the process of automatically managing the lifecycles of objects in memory, which reference counting certainly achieves.