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    Fibonacci sequence is specified as 1, 1, .., but index is not specified as 1-based with this Fibonacci sequence. ( It would make sense to switch to 0-based indices, like almost all programming languages use, and the 0, 1, ..-based sequence. This would not invalidate existing solutions. )

    The example tests have no tests with small indices. This would help find off-by-one errors early and easily.

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    "getLastDigit()" function name in the describe block, but in work and test space had "getFibNumb()" function name.
    This is minor issue, but still.
    P.S. Thanks for good kata.