I don't get it. Why null isn't a number and new Number(1) is?

I don't get the logic of third test. Why [-1] instead of [-1,0]?

#Keep in mind, you cannot divide by zero. If an attempt to divide by zero is made, return null.
This not tested. In my solution division by zero returns Infinity.

It's specified in description

Fixed. Thank you

The kata editor doesn't validate example test cases. Therefore, it's possible to post a kata with incorrect examples

Cool

I'm not sure whether it's an issue or not, but current tests don't handle punctuation, and it isn't specified in description

There is a missing space in error messages:
"Test Failed: Testis not "Test" ciphered in Rot13!"
Also, they don't provide the given input nor actual output

I tried to pass November instead of December. There was Runtime error, but visually the doors were open. Also, the doors get opened on 24'th of each month, not just December. On the other hand, dates after 24'th of December aren't considered a legit solution for some reason.

Is this solution legit?
http://www.codewars.com/dojo/katas/reviews/527c4524bb28909e13000076/groups/527e04d6bb2ea5840a000505

Shouldn't redefinition of Kernel class method cause some major consequences? I solved it this way to see the right answers, and I expected everything to be frozen, but the test passed

I guess ties are inputs making several differen results possible. For example, "aa bb cc dd". Such cases are not tested, so there is no need to care about them.