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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.
I think the missing piece in the voting might be something like "readability". I seems that best practise is used too fuzzy way.
About the performance: Maybe the site will be able to figure it out / compare it by itself one day. I don't see why that should affect your voting.
Besides the unneeded casting, I really like the readability of this one.