I'm using Godot 4 game engine and write code with GDScript. I've written a custom library that allows me to describe game logic in a declarative way
What does this code do?
```
var declaration = DDeclaration.new([
  DDeclare.new([
    DState.stack({
      "Counter": 0
    }),
    DEvent.stack(["Incremented"])
  ]),
  DSubscribe.to_ref("Incremented").do([
    DSetState.to_ref("Counter").value([
      DSum.new([
        DGetState.from_ref("Counter"),
        DStatic.new(1)
      ])
    ])
  ])
])
```
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