INCRBYFLOATIncrement the float value of a key by the given amount.
| Syntax | INCRBYFLOAT key increment |
| Group | string |
| Arity | 3 |
| Since | 1.0.0 |
| Flags | write |
| Complexity | O(1) |
| Redis compatibility | differs: arithmetic is f64 and the reply uses Rust's shortest-round-trip float printer, not a long double accumulator, so trailing digits can diverge from Redis |