Minor fixes to Truncations/Core, Ideal, Bool, Empty #2997

Job	Run time
nix	2m 6s
quick-build (supported, ubuntu-latest)	3m 18s
quick-build (latest, ubuntu-latest)	3m 22s
quick-build (dev, ubuntu-latest)	3m 8s
build (supported)	3m 25s
opam-build (supported, ubuntu-latest)	4m 51s
build (latest)	3m 32s
opam-build (latest, ubuntu-latest)	4m 48s
build (dev, --warnings)	3m 28s
opam-build (dev, ubuntu-latest)	4m 38s
doc-coqdoc	1m 32s
doc-dep-graphs	7m 32s
coqchk (supported)	2m 3s
doc-alectryon	15m 50s
coqchk (latest)	1m 57s
doc-timing	4m 47s
install (supported)	1m 43s
coqchk (dev)	1m 45s
install (latest)	1m 41s
install (dev)	1m 44s
deploy-doc	0s
delete-artifacts	7s
	1h 17m 17s

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