TYPO3 Core

The FAL driver configuration, which is defined in a FlexForm and saved as XML into the database row, gets converted by a custom method.
\TYPO3\CMS\Core\Resource\ResourceFactory::convertFlexFormDataToConfigurationArray

A more technically mature and suitable method exists in FlexFormService, which also allows the usage of multiple FlexForm sheets, instead of the current flat FlexForm structure.
Values from multiple sheets are not passed to the driver's constructor, but the sheets are rendered correctly as tabs in the driver configuration section.