fix type stability for DefaultCache
#4699
| Job | Run time |
|---|---|
| 19m 39s | |
| 14m 1s | |
| 15m 4s | |
| 33m 33s | |
| 23m 55s | |
| 24m 18s | |
| 22m 9s | |
| 32m 35s | |
| 50m 28s | |
| 46m 42s | |
| 46m 0s | |
| 43m 1s | |
| 45m 1s | |
| 40m 43s | |
| 36m 28s | |
| 42m 2s | |
| 42m 30s | |
| 9h 38m 9s |