I've tried that, but couldn't get it to work. It would crash the VM on first run (GC failing).
I've added this to `vm/builtin/time.hpp`
```cpp
private:
   ....
   Object* zone_; // slot
   ...
public:
   ....
   attr_accessor(zone, Object);
```
And cleaned so that it could regenerate vm/gen files. What am I missing?