In some adventure maps, people used INVedit to makes swords invincible by changing the damage to -32768.
I'd wanted to try out an adventure map that started out with these in the 1.5 update. Except the sword's damage actually went down normally. This made it nearly unplayable, since there were no resources to mine, or crafting benches to do so.
I don't know if this was intentional or not, but I request an aversion to this, or for it to be fixed. Thank you for reading.