4 - AAT 'morx' implementation.
6 - Return "safe-to-break" bit from shaping.
8 - Implement 'rand' feature.
10 - mask propagation? (when ligation, "or" the masks).
12 - Warn at compile time (and runtime with HB_DEBUG?) if no Unicode / font
15 - Do proper rounding when scaling from font space? May be a non-issue.
18 * init/medi/fina/isol for non-cursive scripts
21 API issues to fix before 1.0:
22 ============================
24 - API to accept a list of languages?
26 - Add init_func to font_funcs. Adjust ft.
28 - hb-ft load_flags issues.
30 - Add pkg-config files for glue codes (harfbuzz-glib, etc)
32 - 'const' for getter APIs? (use mutable internally)
34 - Remove hb_ot_shape_glyphs_closure()?
40 - Language to/from script.
46 - Add sanitize API (and a cached version, that saves result on blob user-data)
48 - BCP 47 language handling / API (language_matches?)
50 - Add hb_font_create_unscaled()?
52 - Add query / enumeration API for aalt-like features?
54 - SFNT api? get_num_faces? get_table_tags? (there's something in stash)
56 - Add segmentation API
58 - Add hb-fribidi glue?
61 hb-view / hb-shape enhancements:
62 ===============================
64 - Add --width, --height, --auto-size, --ink-box, --align, etc?
70 - ot-layout enumeration API (needs font)
72 - Finish test-shape.c, grep for TODO
74 - Finish test-unicode.c, grep for TODO
76 - GObject, FreeType, etc
78 - hb_cache_t and relatives
80 - hb_feature_to/from_string
81 - hb_buffer_[sg]et_contents