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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 wondered the same thing, similarly to you I used parseInt in the divideBy function but then after submitting I noticed in the top solutions they did not do anything special in the divideBy function. I wonder if the Kata has changed to only allow ints since those solutions were submitted?