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var s = '';
var a = [, 0, 1];
for (var i in a) {
a.reverse();
s += i + ',';
}
// Index of the element with value '0'.
assertEq(s, '1,');
var s = '';
var a = [, 0, 1];
for (var i in a) {
a.reverse();
s += i + ',';
}
// Index of the element with value '0'.
assertEq(s, '1,');