Here is what MicroChip says on one of their data sheets. Note that the implication is that the device will not latchUp if the current is limited to +-20mA, however, on another line it says that the pin must be constrained to +0.3V above and below Vdd and Vss, respectively. How can you obey both of these constraints simultaneously?
By the presence of a simple series resistor, when the CLAMPING diodes (NOT ESD diodes) will provide any required protection. MicroChip even stick direct mains in via a suitable series resistor, for zero crossing detection etc.
I would also suggest you take datasheets with a 'pinch of salt', as it's rare to get one that isn't full of errors.