What is status of order_magic_number when it has not been set?

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What is the status of order_magic_number when it has not been set?

Does it = 0 or NULL or empty?

 

Look documentation:

int OrderSend( string symbol, int cmd, double volume, double price, int slippage, double stoploss, double takeprofit, string comment=NULL, int magic=0, datetime expiration=0, color arrow_color=CLR_NONE)

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