Changelog

1.0.0

First release, for Minecraft 1.21.1 (Fabric).

• Identical enchanted books (same stored enchantments, levels and other components) stack up to 16.
• Config file config/stackable_enchanted_books.json with maxStackSize (1–64, default 16). It is read at startup. An invalid value logs one warning and falls back to 16, and the file is never overwritten.
• Anvil: a book stack in the right slot loses exactly one book per operation.
• Anvil: a book stack in the left slot with an addition is worked one book at a time, at the normal single-book XP cost. Shift-click takes one result. Renaming a whole stack (empty right slot) keeps the vanilla behaviour.
• Grindstone: a lone book stack is ground one book at a time, with the XP of one book per take.
• Headless GameTests cover all of the above in both the development and the production (intermediary) environment.