Why I cannot modify the result object <p>Why the objects returned by sequelize <code>findAll</code> and the likes cannot be modified like regular objects? I checked if they are frozen or locked, but <code>Object.isFrozen()</code> returns false. Does it use getters instead of real properties (how do I check that?)</p> <p>So far my only option to modify the results is to do <code>JSON.parse(JSON.strigify(result))</code> which is OK, but incurs performance price.</p>