mutating func decodeMessage<D: SwiftProtobuf.Decoder>(decoder: inout D) throws {
    while let fieldNumber = try decoder.nextFieldNumber() {
      switch fieldNumber {
      case 1: try decoder.decodeSingularSInt64Field(value: &self.min)
      case 2: try decoder.decodeSingularSInt64Field(value: &self.max)