[kevincox]

But the universe is constantly changing. So you will need to know the specific bits of the universe that your function depends on or you will never get a hit.

[_y5hn]

Is the universe changing, or just your references to it?

[LogicUpgrade]

So the references are mutable. Gotcha.

[_y5hn]

Aye, functional core, imperative shell (us!).