How can I preserve type info when using RedisTemplate to store data?

I'm using RedisTemplate to store Long value, I store it successfully, I expect that I can get that Long value back, but the type of that value is not Long, but Integer.

RedisTemplate<String, Object> = redisTemplate();

Long l = 1L;
redisTemplate.opsForValue().set("l", l);
Object o = redisTemplate.opsForValue().get("l");
System.out.println(o.getClass().getName()); // the output is "java.lang.Integer", not "java.lang.Long"

public RedisTemplate<String, Object> redisTemplate() {
    // setup jackson2JsonRedisSerializer
    Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer =
            new Jackson2JsonRedisSerializer<>(Object.class);
    ObjectMapper objectMapper = new ObjectMapper()
            .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
            // https://stackoverflow.com/questions/7105745/how-to-specify-jackson-to-only-use-fields-preferably-globally
            .setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.NONE)
            .setVisibility(PropertyAccessor.FIELD, JsonAutoDetect.Visibility.ANY)
            // https://stackoverflow.com/questions/17694042/jackson-default-typing-for-object-containing-a-field-of-mapstring-object
            .enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
    jackson2JsonRedisSerializer.setObjectMapper(objectMapper);

    RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>();
    JedisConnectionFactory jedisConnectionFactory = createFactory(); // you don't need to worry about `createFactory()`
    redisTemplate.setConnectionFactory(jedisConnectionFactory);
    redisTemplate.setKeySerializer(new StringRedisSerializer());
    redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);

    redisTemplate.afterPropertiesSet();

    return redisTemplate;
}

How can I preserve type info when using RedisTemplate to store data?