Unbreaking Doesn't Exist In /enchant
In the 1.0 beta (0.17) when you do /enchant unbreaking isnt on the list and when you do /enchant @p unbreaking 3 it gives an error
In the 1.0 beta (0.17) when you do /enchant unbreaking isnt on the list and when you do /enchant @p unbreaking 3 it gives an error