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This is much the same approach as I used for SymfonyTest/SymfonyConfigTest#73, but now for this package. Overall gist of the changes:
The one "hard" B/C break is the removal of
LoaderFactory::createIniFileLoader()
as INI support is untested and there aren't many test fixtures for this even in Symfony's repo to set something up to at least cover it (doubt this actually has a major impact).