@CheckReturnValue
    @NonNull
    @SchedulerSupport(SchedulerSupport.NONE)
    public static <T> Maybe<T> defer(final Callable<? extends MaybeSource<? extends T>> maybeSupplier) {
        ObjectHelper.requireNonNull(maybeSupplier, "maybeSupplier is null");
        return RxJavaPlugins.onAssembly(new MaybeDefer<T>(maybeSupplier));
    }