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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.
Judging by the fact it hasn't been solved in 4 months and no feedback given to your comment, it seems that nobody really cares about those corner cases. :( Although they render a good portion of solutions plainly wrong.
There's also a really interesting one edge case: (2^26 + 1)^2 - 1. Solutions that test for fraction part of sqrt() to be zero will think it's a perfect square.