v8/test/mjsunit/regress/regress-91013.js

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// Test that KeyedStore stub for unboxed double arrays backing store
// correctly returns stored value as the result.

// Flags: --allow-natives-syntax --unbox-double-arrays

// Create array with unboxed double array backing store.
var i = 100000;
var a = new Array(i);
for (var j = 0; j < i; j++) {
  a[j] = 0.5;
}

assertTrue(%HasDoubleElements(a));

// Store some smis into it.
for (var j = 0; j < 10; j++) {
  assertEquals(j, a[j] = j);
}

// Store some heap numbers into it.
for (var j = 0; j < 10; j++) {
  var v = j + 0.5;
  assertEquals(v, a[j] = v);
}