title: "email:Pk[String]" vs "id:Pk[Long]"
body: <p>In some examples, I'm seeing <code>email:Pk[String]</code> under the <code>User</code> class but in others I see <code>id:Pk[Long]</code> (both not assigned). A user can change their email as much as they want but the ID will not change so <strong>is there a (security) reason behind this?</strong></p>