Fix off-by-one issue in `isOverlapping` #1916

Job	Run time
test-linux	3m 7s
tests (windows-latest)	4m 42s
builds	15m 47s
tests (macos-latest)	4m 34s
tests (buildjet-4vcpu-ubuntu-2204-arm)	4m 21s
	32m 31s

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