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    Extending prototypes, even if not for the faint of heart, on Array ( and, yes, even on Object ! ), can be done correctly and safely. But that isn't specified or tested for here.

    This deserves to be marked as an Issue ( which will need a new comment ).

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    #Taking about JavaScript

    It's an extremely bad practice to declare properties/methods on Builtin Objects such as Array.
    The author of this Kata should correct this detestable part.