create
Creates a single stack of this item, fully finalized (meta, identity, behaviours).
Every call builds a fresh stack from scratch, so any per-stack state (durability charges, custom persistent data written after creation) starts at its default. To mutate an existing item — e.g. spend a durability charge — operate on the stack already in the inventory, not on a new one from here.
Creates a stack of amount copies of this item.