Embed::documents embeds only the families an app names, whole, and an
unknown name is Error::UnknownFamilies listing the manifest's families.
Embed::embedded_elsewhere lets check_text and the catalog check count
faces another table embeds. EmbeddedFace::is_cjk. The embed() shorthand,
which embedded every face, is gone.
The interface faces in craft-fonts are full Regular TrueType sources. With the
subset feature (build-dependencies only), Embed::subset_to cuts each one with
skera to the catalogs' characters from U+2E80 up plus CJK punctuation, kana and
full-width forms, keeping every layout feature, and embeds the cut from OUT_DIR.
for_ui without catalogs leaves the interface faces out with a warning; a CFF
interface face is an error. check_text and the catalogs warn only about
characters no embedded face covers.
The manifest's optional ninth field, role, marks the UI subsets (ui). check_text reads
the selected faces' cmaps (formats 4 and 12) with a small reader, so the crate keeps
no dependencies.
aiongg