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Could somebody subtitle what the defining property of a curve "like this" is? I don't feel like reverse engineering it.
Added the relevant information.
Is it a question or an issue? I suppose it's a question.
I think that the numbers are correct. One needs everybody to make a world, not only "1kyu":-) More, nobody prevents you to give a non pretty weak solution or to fork the existed one to have stronger tests though in JS one doesn't go very far with large numbers.
Don't worry, I am only teasing you:-)
Honest answer: yes, it was intentional. You can look at other katas I wrote and see if a weak solution will pass.