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Cuando usamos el segundo nivel, todav\u00eda otorgamos permisos separados que permiten WriteOnly, lo que parece inconsistente e inc\u00f3modo. Queremos tener un comportamiento consistente. Despu\u00e9s de pasar al primer nivel, no queremos que las cosas funcionen a veces y se rompan si usamos el segundo nivel para las mismas asignaciones. 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