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bug of run result

I would like to give some feedback about ...

do not manipulate original array, but why display [null,null,null,null]??

From: https://js.checkio.org/mission/non-unique-elements/solve/

HTTP_USER_AGENT:

Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36
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Created: Dec. 27, 2016, 9:48 a.m.
Updated: Dec. 27, 2016, 9:48 a.m.
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DerekWang87