docs: @Nullable
      public static ScheduledExecutorService getTtlScheduledExecutorService(@Nullable ScheduledExecutorService scheduledExecutorService) {
          if (TtlAgent.isTtlAgentLoaded() || scheduledExecutorService == null || scheduledExecutorService instanceof TtlEnhanced) {
              return scheduledExecutorService;
          }
          return new ScheduledExecutorServiceTtlWrapper(scheduledExecutorService);
      }