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@ -191,7 +191,7 @@ The non-configurable flag (`configurable:false`) is sometimes preset for built-i
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A non-configurable property can not be deleted or altered with `defineProperty`.
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A non-configurable property can not be deleted or altered with `defineProperty`.
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For instance, `Math.PI` is both read-only, non-enumerable and non-configurable:
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For instance, `Math.PI` is read-only, non-enumerable and non-configurable:
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```js run
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```js run
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let descriptor = Object.getOwnPropertyDescriptor(Math, 'PI');
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let descriptor = Object.getOwnPropertyDescriptor(Math, 'PI');
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