I agree that it's an easy step to adjust them all, it's just when producing potentially thousands of new npcs it's 1000 extra lines that could be unnecessary and easily forgotten. Since the spell is Invis Vs Undead it should rely specifically on bodytypes 3 and 8 else IVU turns itself into a normal invis spell (which is not what the name implies).
The only time I can think it would be useful is I had say a human that was secretly undead (for some storyline reason perhaps). But then I should still be setting it's bodytype to 3 for undead spells to function.
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