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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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Resolved!
Nice catch! My intention was that
Noneshould be returned if any overflow were to occur.I'll update the description to specify this, and add test cases for
add_mixed_narrowing()andadd_mixed_signs()to test this case.Edit: Kata has been updated.