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Cascading attributes enables managing settings in a flexible way.
Instance administrator can define an instance-wide default setting, or lock the setting to prevent change by group owners.
Group maintainers/owners can define a default setting for their group, or lock the setting to prevent change by sub-group maintainers/owners.
When a group does not have a value (value is `nil`), cascade up the hierarchy to find the first non-nil value.
Settings can be locked at any level to prevent groups/sub-groups from overriding.
If the setting isn't locked, the default can be overridden.
An instance administrator or group maintainer/owner can push settings values to groups/sub-groups to override existing values, even when the setting is not otherwise locked.
Methods included from