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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.
It's on the kata's sensei to handle that. I got something like "7.986 should equal 7.986000000000001" but it's not like I can "unround" my answer. If the kata's sensei is going to compare two floats, they should subtract the two values from each other and compare it to an error threshold.
For example:
abs(floatOne - floatTwo) < 0.000001
Why this hasn't been more established at this kyu level, I don't know.