src/v8/test/mjsunit/regress/regress-728.js

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var obj = { 0: "obj0" };

// Array index k is to big to fit into the string hash field.
var k = 16777217;
var h = "" + k;

obj[k] = "obj" + k;

// Force computation of hash for the string representation of array index.
for (var i = 0; i < 10; i++) { ({})[h]; }

function get(idx) { return obj[idx]; }

assertEquals(get(0), "obj0");
assertEquals(get(h), "obj" + h);