More precise array_keys return type
#18491
| Job | Run time |
|---|---|
| 1m 24s | |
| 1m 28s | |
| 2m 53s | |
| 2m 34s | |
| 3m 26s | |
| 2m 29s | |
| 1m 32s | |
| 2m 25s | |
| 2m 44s | |
| 2m 38s | |
| 1m 26s | |
| 2m 25s | |
| 1m 19s | |
| 2m 30s | |
| 1m 19s | |
| 2m 23s | |
| 1m 22s | |
| 2m 23s | |
| 38m 40s |