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//
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// Internal object we got from native code should not be writable,
// configurable or enumerable. One can still change its public properties, but
// we don't use them to do actual work.

var format = new Intl.NumberFormat([]);

// Direct write should fail.
format.formatter = {'zzz':'some random object'};

assertFalse(format.formatter.hasOwnProperty('zzz'));

// Try redefining the property.
var didThrow = false;
try {
  Object.defineProperty(format, 'formatter', {value: undefined});
} catch(e) {
  didThrow = true;
}
assertTrue(didThrow);

// Try deleting the property.
assertFalse(delete format.formatter);