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HMC430 NC pins

I would like to know whether HMC430(LP4) N/C pins may be connected to ground to ease layout or should they be left unconnected.

Datasheet says N/C = No Connection with no other detail. I can't understand if this is a real DNC (Do Not Connect) or it means that there is no connection inside so that we can treat them either as a GND or leave unconnected.