If You Know What I Mean And I Think You Do ?
Back on the subject. Of course, everyone knows that the "items are not damaged by spells unless you roll a '1' on your save" rule is here for player characters, not for NPCs. And that it's here for fun, ease or using the game, avoiding boredom, staying balanced, etc., not to imply a supernatural selective effect of the spells ("we use surgical strikes with our spells, only the baddies are affected, we limit collateral damage and destruction of the environment to the minimum").
Reasons: The average PC get fireballed (or a similar spell) everyday after having reached mid-level. To not save his equipment would force the average PC to walk around naked and gearless.
For the same reason, there is no rules that say the potion vials a PC is carrying in his backpack are broken after the PC fall from a cliff. This kind of ruling is left to DM's common sense.
I have not hesitated to told a PC incinerated by a red dragon's breath that her clothing were ruined, and that she was also bald until her hair grew again. (Similarly, I considered a gnome wizard of mine got her long hair reduced to nothing after being nearly incapacited by an angry pyrohydra, even if there are no rules saying that fire burn hair and it stinks after -- common sense).
So, feel free to say arbitrarily that something or another didn't survived an attack, magical or otherwise. As long as it's here to strengthen the suspension of disbelief, and not to screw the players, it's good.