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Encoding: Introduce WHATWG-compliant encoding name canonicalization. #40610

Job	Run time
Core running from build / Linux	1m 50s
Core running from src / Windows	2m 50s
Core running from src / MacOS	2m 31s
Core running from build / Windows	3m 11s
Core running from src / Linux	1m 44s
Core running from build / MacOS	1m 59s
Slack Notifications	-1s
Failed workflow tasks	-1s
	14m 3s