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    I had to submit my solution 3 times - it seems, that author either:

    a) found bug in Ruby Prime
    b) know better than Ruby Prime if the number is prime or not

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    • What about letting people know how fast is code execution of individual persons katas and giving people score for faster code?

    • Also what about checking securit issues? (people can audit code of others and check for possible security vulnerabilities and this will result in lowering persons score?)