Fix `Seq.iteri` is not avaliale in old version ocaml in ci #74

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Run time

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Job	Run time
build (4.08.1, ubuntu-latest)	3m 11s
build (5.0.0, ubuntu-latest)	3m 5s
build (5.0.0, macOS-latest)	3m 26s
build (macos-12, 4.08.1)	3m 23s
	13m 5s