4 - AAT 'morx' implementation.
6 - Return "safe-to-break" bit from shaping.
8 - Disable 'vert' if 'vrt2' is available (eg. Motoya fonts with arrow chars).
10 - Fix TT 'kern' on/off and GPOS interaction (move kerning before GPOS).
12 - Implement 'rand' feature.
14 - mask propagation? (when ligation, "or" the masks).
16 - Warn at compile time (and runtime with HB_DEBUG?) if no Unicode / font
19 - Do proper rounding when scaling from font space? May be a non-issue.
22 * init/medi/fina/isol for non-cursive scripts
23 * vkna,hkna etc for kana, etc
24 * smpl,trad for ZHS / ZHT
27 API issues to fix before 1.0:
28 ============================
30 - API to accept a list of languages.
32 - Add default font_funcs / Unicode funcs API and to utils.
34 - Add init_func to font_funcs. Adjust ft.
36 - Add pkg-config files for glue codes (harfbuzz-glib, etc)
38 - Figure out how many .so objects, how to link, etc
40 - 'const' for getter APIs? (use mutable internally)
48 - Language to/from script.
50 - Buffer (de)serialize API ala hb-shape?
54 - Add sanitize API (and a cached version, that saves result on blob user-data)
56 - Add glib GBoxedType stuff and introspection
58 - BCP 47 language handling / API (language_matches?)
60 - Add hb_font_create_linear()?
62 - Add query API for aalt-like features?
64 - SFNT api? get_num_faces? get_table_tags? (there's something in stash)
66 - Add segmentation API
68 - Add hb-fribidi glue?
71 hb-view / hb-shape enhancements:
72 ===============================
74 - Add --width, --height, --auto-size, --align, etc?
80 - ot-layout enumeration API (needs font)
82 - Finish test-shape.c, grep for TODO
84 - Finish test-unicode.c, grep for TODO
86 - GObject, FreeType, etc
88 - hb_cache_t and relatives
90 - hb_feature_to/from_string
91 - hb_buffer_[sg]et_contents