allow DiskArrays.cache to operate on the parent of a dimarray.
#2514
| Job | Run time |
|---|---|
| 15m 50s | |
| 13m 31s | |
| 16m 11s | |
| 25m 17s | |
| 22m 27s | |
| 25m 6s | |
| 26m 8s | |
| 2h 24m 30s |