src/v8/test/mjsunit/regress/regress-241344.js

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// Create a JSON string for an object with indexed properties.
// Parsing that string creates a sparse array that grows dense.

var jsonstring = '{"0":0.1, "10000":0.4, ';
for (var i = 1; i < 9999; i++) {
  jsonstring += '"' + i + '":0.2, ';
}
jsonstring += '"9999":0.3}';

var jsonobject = JSON.parse(jsonstring);
for (var i = 1; i < 9999; i++) {
  assertEquals(0.2, jsonobject[i]);
}