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    signum and abs is not tested.

    But in case you are wondering, the math answer for diff signum should be:

    diff signum 0 = undefined
    diff signum _ = 0
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    What is the expected return of

    diff signum 0
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    This comment is hidden because it contains spoiler information about the solution

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    Indeed, there is a bug in haskell translation:
    For very large int, (read x) will give an wrong result: (Int is not a big int, it allows only 2^32 at most)

     (read "12379868686876789689697869868969857344444444444444777777777777777777777777777777777774345945496969" :: Int)

    I think the read function is not important, as it always returns Int

    However, the test do not respect the big int. Because I am new to codewars, I am not sure how to contribute to the kata test.