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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.
That's not "clean", that's just way more code than necessary.
It was submitted when kata had no random tests, and for some reason it was not invalidated.
Wtf.
Wait, how did that make it through the tests?
God damit, I felt so good about my couple of lines of haskell…
I think the spec or default tests need more details. Several special cases are not covered explicitly and only sometimes caught by the random tests. Specifically: