HistoricalOrder.OrderType

HistoricalOrderType OrderType {get;}

historicalOrder.OrderType: HistoricalOrderType

var limitOrders = HistoricalOrders.Where(order => order.OrderType == HistoricalOrderType.Limit).ToArray();
Print("Historical limit orders: {0}", limitOrders.Length);

limitOrders = [order for order in api.HistoricalOrders if order.OrderType == HistoricalOrderType.Limit]
api.Print(f"Historical limit orders: {len(limitOrders)}")