The action list defined on a permission specify which possible
actions can be assigned when assigning the permission to either a
user, a group, or a role. The assigned actions are stored as an
array of keys, that defines which of the actions were assigned.
// if these are the possible actions:
array('add', 'view', 'edit', 'delete')
// then you should store this when assigning 'view' and 'edit':
array(1, 2)
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