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    Basically you need to check if it's a string or not
    Where we may start with

    'string' === typeof it
    

    And we want it to be short
    Knowing an important fact that it would never be null, then we could tell by accessing unique properties on String, like

    it.replace
    it.match
    it.big
    

    That's it, we just pick the shortest one o_O