docs: @SuppressWarnings("unchecked")
      private ThreadLocalProxyCopyOnWriteArraySet<ThreadLocalProxy<?>> getProxySet() {
          Object property = null;
          property = bus.getProperty(PROXY_SET);
          if (property == null) {
              ThreadLocalProxyCopyOnWriteArraySet<ThreadLocalProxy<?>> proxyMap = new ThreadLocalProxyCopyOnWriteArraySet<ThreadLocalProxy<?>>();
  
              bus.setProperty(PROXY_SET, proxyMap);
              property = proxyMap;
          }
          return (ThreadLocalProxyCopyOnWriteArraySet<ThreadLocalProxy<?>>) property;
      }