In Javascript, does console.log on an object call toString?

Question

Array.prototype.toString = function(){
    return "testing";
}

a1 = [1,2,3];

console.log(a1); // returns [1,2,3]
console.log(a1.toString()); // returns "testing"

why is that? How does the first log print out values? I thought it used the toString method?

Answer 1

For Firefox(both Firebug and Dev Web Console), Chrome: No

For IE: Yes