fix: fix values being promoted to Float64 in problem construction
#6606
| Job | Run time |
|---|---|
| 50m 54s | |
| 36m 33s | |
| 16m 25s | |
| 52m 22s | |
| 24m 26s | |
| 15m 14s | |
| 23m 18s | |
| 39m 2s | |
| 35s | |
| 21m 10s | |
| 28m 35s | |
| 22m 10s | |
| 52m 0s | |
| 6h 22m 44s |