Address some `-Wsign-compare` warnings. #299

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Job	Run time
build-linux (OFF)	4m 20s
build-linux (ON)	4m 22s
build-macos (OFF)	1m 29s
build-windows (OFF)	6m 42s
build-macos (ON)	2m 23s
build-windows (ON)	5m 58s
	25m 14s