Makes me wonder if it wouldn’t be nice to have something like:
[package] name = "unic-ucd" part-of = "unic"
crates.io could also use that to display a "Part of
X" on crates like
unic-ucd, and a “Other crates in the
X ecosystem” list on crates like
unic. You’d probably want to ensure that only the owner of a crate
X can publish another crate which has
part-of = "X" in its manifest.