interface redis-types {
  // General purpose error.
  enum error {
      success,
      error,
  }

  // The message payload.
  type payload = list<u8>;

  // A parameter type for the general-purpose `execute` function.
  variant redis-parameter {
      int64(s64),
      binary(payload)
  }

  // A return type for the general-purpose `execute` function.
  variant redis-result {
      nil,
      status(string),
      int64(s64),
      binary(payload)
  }
}