How to detect conflicting class preferences?

github.com/magefan/module-conflict-detector

bin/magento maintenance:enable
composer require magefan/module-conflict-detector:*
bin/magento setup:upgrade
rm -rf var/di var/generation generated/code && bin/magento setup:di:compile
rm -rf pub/static/* && bin/magento setup:static-content:deploy en_US <additional locales, e.g.: de_DE>
bin/magento maintenance:disable

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