>
>    The problem with making them open outputs is that they'll be
>    FLOATING INPUTS during power-on reset and before your firmware
>    configures them as outputs.

For a couple of uS, yes. That's harmless.
I don't wait till a week after boot, to init my I/O.


>    Anyone who refuses to tie unused pins to ground should be even more
>    worried about leaving the pins open; it seems much more likely that a
>    floating input pin will latchup than a tied-low input pin will
>    magically become a high-driving output.

Before they latch up, they have to get hot.
Temperature is heat * time / mass.
I can't control the mass, but I keep the time as short as practical.
Typically 10uS after reset goes up, my I/O is initted.

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