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@rcanine shows us this interesting this coerce behaviour within the prototype of Number. Fun!

    (1) === 1; // true
    
    Number.prototype.isOne = function () { return this === 1; }
    
    (1).isOne(); // false!
    
    Number.prototype.reallyIsOne = function () { return this - 1 === 0; }
    
    (1).reallyIsOne(); // true