Sorting an array of objects in Chrome

Question

EDIT: As noted by kennytm below and after investigating myself, according to the ECMA spec, when two objects are determined to be equal in a custom sort, JavaScript is

Answer 1

May be you know it already but you can use an array to sort on multiple columns and avoid this bug:

var customSort = function(a,b) {
    return [a.a, a.b] > [b.a, b.b] ? 1:-1;
}