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Really makes me wish you could invoke instance methods on numbers (ala 5.amIFive())

You can :)

Number.prototype.amIFive = function(){ return this.valueOf() == 5; }

5..amIFive();

Ah, so you have to have two dots... I suppose the first one denotes the floating point value, and the second denotes the prototype accessor. Very clever.

(5).amIFive();

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