Force string type. #11694

Job	Run time
build_details	5s
build_opam (4.14.x)	9m 1s
build_js	2m 17s
build_opam (5.2.x)	5m 7s
lezer_parse	54s
tree_sitter_parse	49s
build_no_depopts	6m 34s
build_posix (debian_trixie, amd64)	12m 15s
build_win32 (x64)	12m 20s
run_tests (@citest)	12m 18s
update_doc	11m 45s
build_posix (debian_bookworm, amd64)	11m 14s
run_tests (@doctest)	7m 45s
build_posix (ubuntu_oracular, amd64)	10m 3s
run_tests (@mediatest)	12m 15s
build_posix (ubuntu_noble, amd64)	11m 5s
build_posix (alpine, amd64)	12m 16s
fetch_s3_artifacts	1s
build_docker	1s
build_docker_alpine_minimal	1s
build_docker_alpine	1s
build_docker_minimal	1s
build_docker_release	1s
build_docker_release-minimal	1s
update_release	1s
	2h 18m 11s

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