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Server-side Fabric mod that duplicates items dropped in the world, creating exactly one marked copy per drop. Includes configurable per-player cooldown, global per-tick duplication cap, TPS-based throttling (pauses below a threshold), and item *********/blacklist with automatic detection of block-entity-bearing items (e.*. shulker boxes) to prevent unsafe duplication. Duplicates are NBT-tagged to avoid re-duplication and receive extended pickup delay. Ships with /dupmod reload and /dupmod status commands, JSON ******, detailed logging, and full source for recompilation to other Minecraft versions.