okay.. hmm.. looks like the param was renamed or removed?
* In the 2.8 conf https://github.com/antirez/redis/blob/2.8/redis.conf#L616 there is a ziplist. 
* In 2.6 there is a ziplist still https://github.com/antirez/redis/blob/2.6/redis.conf#L487
* but in the 2.4 there are both entries https://github.com/antirez/redis/blob/2.4/redis.conf#L457