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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.
How is this a kata issue? You have to do with the implementation available. If you are not happy with a compiler behaviour, fill a bug to their developpers.
Also, you must use a spoiler flag as soon as you post code somewhere. I've put the flag on for you.