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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
I agree @diasjorge, that is annoying to have hash work fine for your own tests but not the authors. I've updated the preloaded code so that Hash is now crippled at all times.
Read the description. It specifically tells you hash is diabled for this exercise.
Why won't Hash work?? It works great in all my test cases. I'm using
object.object_idto identify them.