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A configuration setter must implement only one method: `handle($key, $value)`. Before setting a value in configuration, the setter will be called with this method to check its validity. If a setter has been assigned to a configuration object, it will be called for each of its data so be careful to always return a value (or null if you want to delete the key). See https://github.com/FreshRSS/FreshRSS/issues/730