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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.
test.check doesn't seem to be supported by codewars
Specifically, the author of the test used some bit manipulation to round, when he/she should have used Math.floor. The bit stuff only works with 32-bit integers. I myself submitted a solution with the same bug just to get the tests passing.