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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.
As Chrono79 said 0.66 is an example. Moreover it's a question not an issue. Since 26753 guys passed the kata it seems it's understandable. Maybe you should read the description again.
Why is this an issue and not a question instead? 0.66 is an example, the value is passed as a parameter of your function and you need to validate it.