Router: refactor modification before `(` #3921

Job	Run time
test (8, ubuntu-latest)	8m 56s
test (11, windows-latest)	11m 30s
test (11, ubuntu-latest)	10m 27s
formatting	22s
native-image (macOS-latest, default)	6m 53s
native-image (ubuntu-latest, default)	6m 10s
native-image (ubuntu-latest, musl)	5m 15s
dockerize	0s
	49m 33s

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