fix: fix values being promoted to Float64 in problem construction
#6604
| Job | Run time |
|---|---|
| 51m 49s | |
| 37m 8s | |
| 15m 55s | |
| 51m 26s | |
| 25m 36s | |
| 15m 9s | |
| 23m 26s | |
| 42m 23s | |
| 37s | |
| 20m 54s | |
| 30m 24s | |
| 22m 19s | |
| 52m 21s | |
| 6h 29m 27s |