Bark has not been audited by smart people yet. Use at your own peril!
Bark is up for adoption; if you or someone you know wants to pick up this project, please let me know!
Bark<T> is a pointer type for reference-counted data similar to Arc<T> or Rc<T>.
Unlike Arc, Bark only uses atomic operations when crossing threads, or when all Barks
on a thread are gone.
This means that Bark is as cheap as an Rc when doing thread-local clones and drops, but once
you send one to another thread, it'll start tracking that thread seperately and correctly updates
the cross-thread reference count!