Add hints for replacing some maybe usage with equivalent traverse
#1097
| Job | Run time |
|---|---|
| 17m 23s | |
| 29m 56s | |
| 17m 3s | |
| 34m 56s | |
| 20m 37s | |
| 29m 34s | |
| 24m 56s | |
| 49m 5s | |
| 25m 32s | |
| 39m 39s | |
| 4h 48m 41s |