zskiplist *zslCreate(void);
void zslFree(zskiplist *zsl);
zskiplistNode *zslInsert(zskiplist *zsl, double score, robj *obj);
+unsigned char *zzlInsert(unsigned char *zl, robj *ele, double score);
+unsigned int zsetLength(robj *zobj);
+void zsetConvert(robj *zobj, int encoding);
/* Core functions */
void freeMemoryIfNeeded(void);