refactor: change problem constructors to XProblem(sys, op[, tspan])
#8225
| Job | Run time |
|---|---|
| 1m 30s | |
| 1m 30s |
XProblem(sys, op[, tspan])
#8225
| Job | Run time |
|---|---|
| 1m 30s | |
| 1m 30s |