v8/test/mjsunit/regress/regress-752.js

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// Test that JSON.stringify correctly unwraps Boolean objects.

// See: http://code.google.com/p/v8/issues/detail?id=752

function replacer(key, value) {
  return value === 42 ? new Boolean(false) : value;
}

assertEquals("[false]", JSON.stringify([42], replacer));