When a thread is created, it automatically comes with a new thread-local heap. You can send objects to other threads via channels (which will be deep copied to the other heap). Each thread will allocate objects within its own heap by default.

Note that you can also fall back to GC-free allocation with untraced references (using ptr instead of ref) but will then have to manage that part of the memory yourself (i.e., deallocate untraced objects yourself).