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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 just looked into it and your are right -0 is a thing however unless in string form it has no effect as 0 == -0. As well, this is only the case with floats and the desired return type is an integer. Because in java twos complete is used for integers -0 can't be created for integers.
No, no point.
Is there any point in this because 0 * (-1) == 0?