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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.
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Tell me please, does Kotlin support integer arithmetic? If it does, then you would have no problem with rounding if... you do no rounding. Every test case is (should be) solved solely with integers, and problems with rounding and floating point precision are caused by the fact that you decided to use doubles (or floats). Use ints, do no rounding, use integer division, and you won't have problems.
If Kotlin tests are constructed correctly, that is.
Not a kata issue. If you want ask for 1.4 at: https://github.com/Codewars/codewars.com/issues.
I wouldn't say this is a kata issue, because Kotlin 1.4 isn't available right now in Codewars, it's not the same as it being available and the kata not being updated.