Merge pull request #2331 from tabareau/sortpoly-equality #3903

Job	Run time
quick-build (dev, ubuntu-latest)	3m 26s
quick-build (supported, ubuntu-latest)	1m 28s
opam-build (latest, ubuntu-latest)	2m 2s
nix	47s
quick-build (latest, ubuntu-latest)	1m 31s
build (supported)	1m 34s
build (dev, --warnings)	3m 47s
build (latest)	1m 38s
opam-build (dev, ubuntu-latest)	4m 19s
opam-build (supported, ubuntu-latest)	2m 1s
doc-timing	0s
install	0s
doc-alectryon	0s
coqchk	0s
doc-coqdoc	0s
delete-artifacts	6s
doc-dep-graphs	0s
deploy-doc	0s
	22m 39s

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