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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 with changing the default parameter/return type declarations, as they're incompatible with the test cases. It's trivial to fix, but we shouldn't have to fix it. I haven't had any issues with the test cases, though.