error: #[planning_variable] fields must be Option<usize>; scalar variables store candidate indexes, not external IDs
--> tests/ui/fail/planning_variable_non_usize.rs:8:5
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8 | / #[planning_variable(value_range_provider = "employees", allows_unassigned = true)]
9 | | pub employee_idx: Option<u32>,
| |_________________________________^