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LibJS: Make ObjectPrototype an immutable prototype exotic object
To make this happen, this patch implements the SetImmutablePrototype abstract operation (as a method on Object) and then overrides [[SetPrototypeOf]] on ObjectPrototype.
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@ -100,6 +100,10 @@ public:
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virtual bool internal_delete(PropertyName const&);
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virtual MarkedValueList internal_own_property_keys() const;
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// 10.4.7 Immutable Prototype Exotic Objects, https://tc39.es/ecma262/#sec-immutable-prototype-exotic-objects
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bool set_immutable_prototype(Object* prototype);
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// 20.1 Object Objects, https://tc39.es/ecma262/#sec-object-objects
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Object* define_properties(Value properties);
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