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The NUMA topology struct field `NodeIDs` is a `idset.Set`, which has no public members. As a result, this field is never serialized via msgpack and persisted in state. When `numa.affinity = "prefer"`, the scheduler dereferences this nil field and panics the scheduler worker. Ideally we would fix this by adding a msgpack serialization extension, but because the field already exists and is just always empty, this breaks RPC wire compatibility across upgrades. Instead, create a new field that's populated at the same time we populate the more useful `idset.Set`, and repopulate the set on demand. Fixes: https://hashicorp.atlassian.net/browse/NET-9924