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var obj = {s: ""};
var name = "s";
var a = [];
for (var i = 0; i <= 13; i++) {
a[i] = 'x';
if (i > 8)
a[i] = ++obj[name]; // first recording changes obj.s from string to number
}
assertEq(a.join(','), Array(10).join('x,') + '1,2,3,4,5');
assertEq(obj.s, 5);