Unique ID

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So, I'm creating an item system with unique id's, the problem? Well, it's fairly simple, the dropping of items that're the same but with a unique ID.

I'm thinking a loop is the only way to avoid this, however what if a player is dropping more than one of the same item? So, let's say I had

999 Wooden Bows

If I were to lay 999 Wooden Bows (each of the 999 wooden bows being a unique ID for the item) how would I assign each individual ID to the 'Wooden Bow' about to be dropped without a loop?

Can anyone think of a solution? Thank you