Build matrix

Fix `Seq.iteri` is not avaliale in old version ocaml #75

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Run time

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Job	Run time
build (4.08.1, ubuntu-latest)	4m 56s
build (5.0.0, ubuntu-latest)	5m 9s
build (5.0.0, macOS-latest)	7m 0s
build (macos-12, 4.08.1)	9m 46s
	26m 51s