Haskell CI

Fix & document `computeShift` #60

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Run time

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Job	Run time
build (8.4)	3m 0s
build (8.6)	3m 50s
build (8.8)	4m 56s
build (8.10)	3m 47s
build (9.0)	4m 4s
build (9.2)	3m 18s
build (9.4)	3m 43s
build (9.6)	2m 25s
build (9.8)	2m 29s
	31m 32s