docs: public static void exit()
      {
          Object helper = VMBridge.instance.getThreadContextHelper();
          Context cx = VMBridge.instance.getContext(helper);
          if (cx == null) {
              throw new IllegalStateException(
                  "Calling Context.exit without previous Context.enter");
          }
          if (cx.enterCount < 1) Kit.codeBug();
          if (--cx.enterCount == 0) {
              VMBridge.instance.setContext(helper, null);
              cx.factory.onContextReleased(cx);
          }
      }