RBAC example in _rbac/v1alpha1/rbac.proto_ includes ``` // constraints: // - key: "destination.labels[version]" // value: ["v1", "v2"] ``` That's not right; it should be `values` not `value. See also https://github.com/istio/api/issues/847
