If I will measure voltage drop across shunt resistor at DC circuit, Vin+ vs Vin- difference would be normally positive, right? If I will use single-ended power supply (5V), set Vref to minimum 1.25V and choose maximal shunt resistance to measure 0-30mA to still keep voltages between allowed range, what will happen in case of short circuit (full 3.3V across shunt)? It will momentarily exceed allowed input voltage, but still be there enough room to not exceed maximum rating.