ZSCANIterate a sorted set's members and scores (single-batch cursor).
| Syntax | ZSCAN key cursor [MATCH pattern] [COUNT count] |
| Group | zset |
| Arity | -3 |
| Since | 1.0.0 |
| Flags | readonly |
| Complexity | O(N) — the whole set is materialised |
| Redis compatibility | differs: not a cursor iterator — every call returns the whole set with cursor 0, and COUNT is parsed then ignored |