I have a list of access rights:

```
const (
    Everyone = 0
    Owner = 1
    Administrator = 2
)

```

And a struct representing Routes:

```
type Route struct {
    Name        string
    Method      string
    Pattern     string
    HandlerFunc http.HandlerFunc
    AccessLevel uint64
}

```

How can I restrict `AccessLevel` field value of the `Route` struct be only one of those const from above?