ItemDupeMod
About
A Fabric *.21.11 mod that adds a /dupe command. When a player runs /dupe, the held item's count doubles up to its max stack size. Any overflow beyond the stack limit drops as items on the ground. For example: holding 64 of an item drops 64 on the ground (capped), holding 50 becomes 64 with 36 dropped. Uses the Fabric API command API v2.