I believe the classes field is a bitwise OR with each bit representing a class that might be able to use the item.
IE, if an item is set with a value of 11, that would be 0000000000001011 in binary, and PRESUMABLY that means that clerics, warriors, and rangers could use them (cuz cleric has a class value of 1 = first bit, warrior class=2, next bit, then ranger=4 (I think), two bits down. I might be wrong about what bits mean what classes, but it is a bitwise OR.
The slot works the same way. It's rare, but some items can fit in more than one place, so the slot field is a bitwise OR to accommodate these items too.
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<idleRPG> Rogean ate a plate of discounted, day-old sushi. This terrible calamity has slowed them 0 days, 15:13:51 from level 48.
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