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Compatibility with frozen Object prototype #2773

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  • Freezing the global Object prototype is one of the best ways to defend against Prototype Pollution attacks
  • Doing this changes all properties of the Object prototype to become non-writable
  • JavaScript does not allow you to use the "=" assignment operator to "shadow" any inherited, non-writable object properties -- in particular, the "toString" property
  • The correct way to do this is to use the Object.defineProperty() syntax instead

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