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    In many languages, leading zeros are illegal.

    In most languages, it is not possible to determine the original base of the number after it is created.

    This additional spec cannot be consistently implemented across all languages & will cause 276k+ solutions to be invalidated + unfair difficulty across different languages.

    I think it is better to keep the current spec & just return the digital root in base 10, like in the description.

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    It's retired, nothing left to do with it. Why open an issue on an already retired kata? Closing.