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Style Engine: Improve PHPStan types and avoid fatal errors when storing rules #44389

Job	Run time
Core running from build / Linux	2m 22s
Core running from src / Linux	1m 55s
Core running from src / MacOS	2m 39s
Core running from src / Windows	3m 40s
Core running from build / MacOS	2m 13s
Core running from build / Windows	3m 37s
Failed workflow tasks	0s
Slack Notifications	0s
	16m 26s