Simpler definition of refine #57

Job	Run time
nix	1m 26s
opam-build (supported, ubuntu-latest)	2m 38s
quick-build (supported, ubuntu-latest)	1m 51s
build (supported)	1m 53s
opam-build (latest, ubuntu-latest)	2m 34s
quick-build (latest, ubuntu-latest)	1m 50s
build (latest)	1m 52s
opam-build (dev, ubuntu-latest)	5m 29s
quick-build (dev, ubuntu-latest)	2m 0s
build (dev, --warnings)	2m 1s
doc-coqdoc	0s
coqchk	0s
doc-dep-graphs	0s
doc-alectryon	0s
doc-timing	0s
install	0s
deploy-doc	0s
delete-artifacts	8s
	23m 42s

Provide feedback