docs: public static boolean isBroadcast(String groupName, String unitName) {
          try {
              return UnitRouter.SINGLETON.newestDefinition(Unit.fullName(groupName, unitName)).getMeta().getBroadcast() != null;
          } catch (UnitUndefinedException e) {
              throw new RuntimeException("Please call UnitJudge.defined() first.", e);
          }
      }