notifications sorting is wrong

[barisusakli]

[julianlam]

redis 127.0.0.1:6379> zrangebyscore uid:1:notifications:read 0 10
1) "11"
2) "20"
3) "4"
4) "5"
redis 127.0.0.1:6379> hmget notifications:11 text score
1) "julian has posted a reply to: \"asdadasdasd\""
2) "5"
redis 127.0.0.1:6379> hmget notifications:20 text score
1) "baris says : test\n"
2) "5"

Looks like I may be sorting by score, but I also need to sort by timestamp prior to score sort.