[fix] Fix CachingSolver
#851
| Job | Run time |
|---|---|
| 14m 35s | |
| 5m 45s | |
| 51m 5s | |
| 16m 24s | |
| 41m 23s | |
| 9m 58s | |
| 17m 49s | |
| 16m 50s | |
| 16m 34s | |
| 18m 45s | |
| 18m 59s | |
| 54m 17s | |
| 1h 4m 25s | |
| 53m 20s | |
| 19m 38s | |
| 32m 6s | |
| 16m 11s | |
| 17m 32s | |
| 19m 8s | |
| 17m 8s | |
| 8h 41m 52s |