Fix off-by-one issue in `isOverlapping` #1894

Job	Run time
test-linux	3m 34s
tests (windows-latest)	6m 52s
builds	12m 17s
tests (macos-latest)	5m 38s
tests (buildjet-4vcpu-ubuntu-2204-arm)	5m 13s
	33m 34s

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