HTTLReturn per-field remaining TTLs in seconds (-1 no TTL, -2 missing).
| Syntax | HTTL key FIELDS numfields field [field ...] |
| Group | hash |
| Arity | -5 |
| Since | 1.0.0 |
| Flags | readonly |
| Complexity | O(F) fields |
| Redis compatibility | differs: silently accepts a stray NX|XX|GT|LT token before FIELDS where Redis rejects it |