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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.
No, a pin number will always be string because if the number was an integer it would convert it to its simpliest form (simplify it). For example "0001" is a valid pin number but if it was an integer it would be 1, which is an incorrect pin number. Therefore, the original answer is a more appropriate solution.