Fix off-by-one issue in `isOverlapping` #1934

Job	Run time
test-linux	3m 25s
tests (windows-latest)	4m 35s
builds	12m 25s
tests (macos-latest)	2m 20s
tests (buildjet-4vcpu-ubuntu-2204-arm)	4m 8s
	26m 53s

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