[mortoray]

Those are some of the points I'm considering as well when doing the memory management for Leaf. My desire to have predictable destructors is tough to reconcile in a tracing GC.

I'm uncertain of what you mean with "copying the data over" in reference to large data. Surely it's still just the pointer being copied? Or are you speaking of things like `std::vector` in C++ that are value-copied by default?