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add `readonly` option #532

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Run time

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Job	Run time
build (16.x, ubuntu-latest)	46s
build (16.x, windows-latest)	1m 7s
build (16.x, macOS-latest)	1m 26s
build (17.x, ubuntu-latest)	54s
build (17.x, windows-latest)	53s
build (17.x, macOS-latest)	50s
build (18.x, ubuntu-latest)	49s
build (18.x, windows-latest)	45s
build (18.x, macOS-latest)	43s
build (19.x, ubuntu-latest)	49s
build (19.x, windows-latest)	1m 40s
build (19.x, macOS-latest)	49s
build (20.x, ubuntu-latest)	39s
build (20.x, windows-latest)	39s
build (20.x, macOS-latest)	49s
build (21.x, ubuntu-latest)	1m 6s
build (21.x, windows-latest)	53s
build (21.x, macOS-latest)	42s
	16m 19s