memcached 1.5.3 已发布，本次更新主要是 bug 修复，此外，还添加了一个新特性。
从 binprot 添加"GAT"命令到 asciiprot。
Add warning about time on very low TTL's in doc/protocol.txt
pledge privdropping support for OpenBSD
make for loop more clear in logger watcher
fix theoretical leak in process_bin_stat
fix use of unitialized array in lru_maintainer
-o no_hashexpand to disable hash table expansion
fix chunked items set in binprot, read from ascii
adds get and touch command for ascii protocol
"gat [exptime] key [key...]\r\n" will fetch the item and refresh its expiration time. This is great for keys you'd normally either manually delete, or set to 0 TTL. Items rarely hit will expire, leaving more room for others.
This command has existed in the binary protocol for a long time, but now there's party for ascii users.