make sure No uses HIT idiom #1609

Job	Run time
nix	3m 45s
build (supported)	5m 0s
opam-build (supported, ubuntu-latest)	4m 24s
build (latest)	4m 42s
quick-build (supported, ubuntu-latest)	3m 35s
opam-build (8.17, ubuntu-latest)	4m 17s
build (dev, --warnings)	4m 8s
quick-build (latest, ubuntu-latest)	3m 20s
opam-build (latest, ubuntu-latest)	4m 26s
quick-build (dev, ubuntu-latest)	3m 48s
opam-build (dev, ubuntu-latest)	5m 57s
doc-dep-graphs	8m 24s
doc-alectryon	11m 57s
doc-coqdoc	1m 26s
doc-timing	1m 32s
coqchk (supported)	1m 47s
install (supported)	1m 8s
install (latest)	1m 13s
coqchk (latest)	1m 40s
install (dev)	1m 39s
coqchk (dev)	1m 46s
deploy-doc	1s
delete-artifacts	9s
	1h 20m 4s

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