Why does jQuery have undefined in its argument signature, and why does it pass window in again? -

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i see jquery wrapped with...

(function( window, undefined ) {    ... })(window);

source.

i see passes in window again (my guess make accessing faster), why undefined there, , not passed in self invoking function?

my guess protect jquery bozo doing...

var undefined = 'defined';

in instance, undefined string 'defined', , bad.

if i'm right (always first :p), clever way of ensuring undefined always undefined.

am right? can elaborate? passing window again indeed make things faster?

thanks.


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