Rework handling of assignment words #290

Job	Run time
opam-based (ubuntu, 4.11.x)	8m 14s
apt-based	49s
opam-based (ubuntu, 4.11.x, lower-bounds, no-doc)	8m 40s
nix-based (with-nixpkgs)	1m 43s
docker-based (alpine, deploy-image)	5m 35s
opam-based (ubuntu, 4.12.x)	9m 37s
nix-based (with-opam-nix)	2m 18s
docker-based (archlinux)	5m 57s
opam-based (ubuntu, 4.13.x)	8m 59s
docker-based (centos, no-tests)	5m 53s
opam-based (ubuntu, 4.14.x, lower-bounds, no-doc)	8m 42s
nix-flake-checks	2h 30m 30s
docker-based (debian)	6m 48s
opam-based (ubuntu, 4.14.x, deploy-doc)	8m 5s
docker-based (debian-testing)	7m 28s
opam-based (ubuntu, 4.14.1, bytecode)	10m 57s
docker-based (debian-unstable)	6m 38s
opam-based (macos, 4.14.x)	12m 21s
docker-based (fedora)	5m 48s
opam-based (windows, 4.14.x, no-tests)	11m 27s
docker-based (opensuse)	6m 1s
opam-based (ubuntu, 5.0.x)	8m 12s
docker-based (oraclelinux)	6m 9s
docker-based (ubuntu)	5m 20s
docker-based (ubuntu-lts)	7m 3s
	5h 19m 14s

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