What is a commonly associated way of doing this pattern: Say I have a user that has a permission on 5 different type objects that all inherit from each other. I want to make sure that they have an effective permissions call of TRUE if all of them are set to true for a specific objects permission, but I want to represent the idea of "unset" and there fore inherit the permissions sometimes. How does that work in a system like SpiceDB to get this type of behavior?