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    On C#, attempt keeps failing at test 4 due to System.ArgumentNullException : Value cannot be null. (Parameter 'values')
    This doesn't seem to be a code issue as the stack trace points towards the kata test:

    at System.String.JoinCore[T](ReadOnlySpan1 separator, IEnumerable1 values)
    at System.String.Join[T](String separator, IEnumerable`1 values)
    at AreTheySame.comp(Int32[] a, Int32[] b)
    at AreTheySameTests.Test4()