case interface{ ValueAsAny() any }:
handler.writeResult(writer, request, r.ValueAsAny())
info := nexus.OperationInfo{
Token: r.OperationToken,
State: nexus.OperationStateRunning,
}
b, err := json.Marshal(info)
if err != nil {
handler.Logger.Error("failed to serialize operation info", "error", err)
writer.WriteHeader(http.StatusInternalServerError)