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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.
Totally agree. The problem/solution is superficial. A real solution requires importing a list valid TLDs. PSL by Mozilla is probably a good place to start
The test case when you hit submit should be re-written as the way it is written is confusing. I thought it was saying we couldn't use
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...A suggestion could be that you are just testing for this case:
[1,'[',']'].same_structure_as( ['[',']',1] )
(Rather than saying you are using a common workaround).