howto disbale input-buffers

[wolfgang6444]

The microchip spec for attiny 1616 states under 16.3:

Important: For lowest power consumption, disable the digital input buffer of unused pins and pins that
are used as analog inputs or outputs.

This makes absolute sense to me, but I could not figure out how to achieve this.
PinxCTRL only talks about interrupts, pull-ups, and inversion - not about disabeling the input buffer.

[hmeijdam]

[SpenceKonde]

We also provide a wrapper around this that efficiently allows setting, clearing and in some cases even toggling, detailed in the digital i/o documentation, called pinConfig()