Add low-level HashTable API
#615
| Job | Run time |
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| 37s | |
| 2m 42s | |
| 6s | |
| 10m 19s | |
| 8m 36s | |
| 7m 47s | |
| 3m 51s | |
| 10m 57s | |
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| 11m 59s | |
| 6m 30s | |
| 9m 29s | |
| 5m 9s | |
| 7m 11s | |
| 1m 45s | |
| 10m 51s | |
| 5m 0s | |
| 5m 22s | |
| 9m 15s | |
| 13m 51s | |
| 16m 35s | |
| 4m 39s | |
| 4m 48s | |
| 0s | |
| 0s | |
| 2h 41m 11s |