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| """ | |
| Reproducer for HiGHS 1.12.0 semi-continuous variable bug. | |
| Symptom | |
| ------- | |
| When a MIP contains semi-continuous variables (integrality=2) and the LP | |
| relaxation places one or more of them at their lower bound `lo` exactly, | |
| HiGHS may return a "feasible / Optimal" solution that its OWN internal | |
| feasibility check passes (`row viol. 0`), while a separate post-validation | |
| rejects it with `infeasibility = X` where X equals the SC variable's `lo` |
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