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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.
Pro tip: Converting NaN to NaN and back to NaN does pass the above test ;)
The test case in question for most people is probably 0. I thought I had already tested it, but apparently not.
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I'm getting the same thing. I find this kata poorly constructed already, but I like negabinary so I'd like to pass it. There doesn't seem to be any information provided to allow the user to determine what the hidden test case wants, however.