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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.
Actually if you use Decimal("...") instead of float("...") for your calculations, just converting the final result back to float type works.
I agree, not cool to test sizes explicitely indicated as not being tested ... =)
I took me time to see what the problem was, especially as we have no access to which input values are tested.