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For five minutes I stared at the following code... if(value != null && typeof value === "object") { Object.freeze(value); } ... and at the error message that led me to this code: `Object.freeze called on non-object` And then I remembered that js treads null as object (http://www.ecma-international.org/ecma-262/5.1/#sec-11.4.3). This means the `typeof === "object"` will not discover null and freeze will throw an error... So `value != null` will also work when value is undefined. A hard to find bug ;) |
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