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In the first official release, the module has been refactored to make it as portable as possible. The original stored the values in a table. Then it was converted to save into variables. And lastly, instead of using rid, settings are stored by the role name. So now when settings are exported through variables, the settings will be sure to match the correct role - whereas rid can be different on a dev, stage, or prod environment.
I'm happy to announce version 8.x-1.0-alpha2 of the Acquia Purge module for Drupal 8. This version is not intended for general consumption and only targeted at selected customers and internal testing.