Merge pull request #2037 from JasonGross/shld #980

Job	Run time
install (dev, Ubuntu, ubuntu-latest, 4.09.1)	39m 46s
install (dev, macOS, macos-latest, 4.14.2)	34m 40s
install (dev, Windows, windows-latest, 4.13.1, -async-proofs-j 1, git+https://github.com/ocaml/oc...	1h 32m 10s
install (8.20.0, Ubuntu, ubuntu-latest, 4.09.1)	39m 1s
install (8.20.0, macOS, macos-latest, 4.14.2)	36m 52s
install (8.20.0, Windows, windows-latest, 4.13.1, -async-proofs-j 1, git+https://github.com/ocaml...	1h 32m 58s
install (8.19.0, Ubuntu, ubuntu-latest, 4.09.1)	40m 25s
install (8.19.0, macOS, macos-latest, 4.14.2)	39m 5s
install (8.19.0, Windows, windows-latest, 4.13.1, -async-proofs-j 1, git+https://github.com/ocaml...	1h 34m 50s
install (8.18.0, Ubuntu, ubuntu-latest, 4.09.1)	41m 58s
install (8.18.0, macOS, macos-latest, 4.14.2)	41m 34s
install (8.18.0, Windows, windows-latest, 4.13.1, -async-proofs-j 1, git+https://github.com/ocaml...	1h 39m 3s
	11h 32m 22s

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