Rework handling of assignment words #287

Job	Run time
nix-based (with-nixpkgs)	2m 47s
opam-based (ubuntu, 4.11.x)	7m 49s
nix-based (with-opam-nix)	9m 3s
apt-based	56s
opam-based (ubuntu, 4.11.x, lower-bounds, no-doc)	8m 15s
docker-based (alpine, deploy-image)	6m 53s
opam-based (ubuntu, 4.12.x)	8m 19s
docker-based (archlinux)	5m 58s
opam-based (ubuntu, 4.13.x)	8m 6s
docker-based (centos, no-tests)	4m 55s
nix-flake-checks	1h 15m 45s
opam-based (ubuntu, 4.14.x, lower-bounds, no-doc)	7m 40s
docker-based (debian)	5m 37s
opam-based (ubuntu, 4.14.x, deploy-doc)	9m 26s
docker-based (debian-testing)	5m 41s
opam-based (ubuntu, 4.14.1, bytecode)	9m 45s
docker-based (debian-unstable)	5m 37s
opam-based (macos, 4.14.x)	12m 18s
opam-based (windows, 4.14.x, no-tests)	13m 21s
opam-based (ubuntu, 5.0.x)	8m 3s
docker-based (fedora)	5m 43s
docker-based (opensuse)	5m 51s
docker-based (oraclelinux)	6m 22s
docker-based (ubuntu)	5m 37s
docker-based (ubuntu-lts)	5m 30s
	4h 5m 17s

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