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    The null value does not represent a number. A Number object does represent a number.

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    I reworked the error messages and now they provide given input, expected output and actual output.

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    Thank you for your feedback.

    I'll look over the testcases and improve them. I don't know if I'll find time for it today, but as soon as they are ready I will let you know it.

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    There's no one right answer to this one. I do think that that particular solution is less clever than, say, mine, but there's nothing incorrect about it...