stats: const-ify variables and arguments
#50
| Job | Run time |
|---|---|
| 18s | |
| 17m 13s | |
| 16m 54s | |
| 16m 59s | |
| 17m 21s | |
| 16m 50s | |
| 16m 52s | |
| 15m 4s | |
| 14m 49s | |
| 37m 38s | |
| 20m 10s | |
| 24m 22s | |
| 29m 14s | |
| 14m 10s | |
| 22m 59s | |
| 22m 24s | |
| 22m 30s | |
| 5h 25m 47s |