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What's the overhead with asynchronous function calls.

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var ii = 1;

while (ii--) {
 do_it();
}

function do_it() {}

var ii = 1;

(function label_1() {
 if (!ii--) return;
 do_it(function() {
  label_1();
 })
})()


function do_it(next) {
 next();
}

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