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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.
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This is a big deal: without negative numbers (or unary minus), one can use a much, much simpler parser.
seems it's not consistent through all languages. I guess your version hs been updated with random tests.
I added the 142857 in a new "clarifying anti-example" section in the description in hopes of improving the understanding of this kata's requirements.
I resisted creating this out of concern that I was creating a "wall of text" that either won't get read or that otherwise discourages kata attempts.
My favorite kata on here are terse, deceptively simple and their solutions profoundly satisfying.
142857 is 5-parasitic but 142857 ends in 7 NOT with 5 as the title "n-parasitic ending in n" and the "Special Parasitic Numbers" section clearly calls out.