A new enchantment: "Last Chance."

I propose adding a new enchantment that prevents an item from breaking completely. Instead, when the item's durability runs out, it would remain in a broken state—much like Elytra do now.

Elytra themselves would lose this default behavior; they would need to be enchanted with this effect separately to ensure they remain in your inventory after breaking.

This enchantment would not conflict with Mending, but it would conflict with the Curse of Vanishing.