HTCC-AB02 unused pins - best practice?

Hey fellas,

one quick question.
I’m using the CubeCell modules in my own PCB design with a battery. Therefore it is important to reduce the current as much as possible. I’ve noticed that the total current comsumption is floating in every single module between 6uA and 28uA. What is the best practice for unused pins? Should I connect them physically to GND or just leave them unconnected and set them as input with internal PU/PD?

In the basic example, it is indicated that the GPIO needs to switch the pin to Analog mode

pinMode (GPIO, ANALOG);

My CubeCell 1 / 2AA Node board consumes 3.5μA in sleep mode