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

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    I'm getting:

    Should work for values different from numbers too: [True, False, False, True, False, True, True, False, True] should equal [True, True, True, False, False, True, False, True, False]

    but when I input that and compile it on my machine it works fine?

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    It is not clear when zeroes should be left;

    Test.assert_equals(increment_string("foobar99"), "foobar100")
    Test.assert_equals(increment_string("foobar099"), "foobar100")