Method decrease_borrow_count

src/sharedref.rs:261–264

(&self, _py: Python)

    }

    fn decrease_borrow_count(&self, _py: Python) {
        let prev_count = self.borrow_count.fetch_sub(1, Ordering::Relaxed);
        assert!(prev_count > 0);
    }

    fn current_generation(&self, _py: Python) -> usize {
        self.generation.load(Ordering::Relaxed)