A "box" that stores a IdString64Box object across multiple frames.
Normally, IdString64s are temporary objects that can only be safely used within a single frame. When you need an IdString64 value to persist across multiple frames, you can call IdString64Box.store() to store the vector in a IdString64, and [IdString64.unbox()] to retrieve the stored values.
For more information, see Object Lifetimes and Userdata Binding.