test/mjsunit/regress/regress-95920.js

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// Tests that objects with external arrays cannot be sealed or have their
// properties redefined.

Object.preventExtensions(new Int8Array(42));
Object.seal(new Int8Array(42));

// No elements, so should succeed.
Object.freeze(new Int8Array(0));

var o = new Int8Array(42);
assertThrows(function() {
  Object.freeze(o);
  assertUnreable();
  }, TypeError);

// Freeze should still have managed to preventExtensions o.
assertFalse(Object.isExtensible(o));

assertThrows(function() {
    Object.defineProperty(new Int8Array(42), "1",
                          { writable: false, value: "1" });
    assertUnreable();
  });