Mutators are only working on direct prop access

[Novivy]

export class User extends Model {
    static table = 'users';
    static primaryKey = 'id';

    attributeUsername() {
        return Attribute.make({
            get: (value) => 'test-username-overwrite',
        });
    }
}

const user = await User.query().find(1); 
res.json(user.username); //output: "test-username-overwrite"

res.json(user); //output: {id:1, username: "John"} 
res.json(user.toData()); //output: {id:1, username: "John"}

I don't know if it's intended but what I was excepting is the mutator to apply everywhere

Does there is any other way to disable the auto cast on created_at/updated_at?