4 - API to accept a list of languages?
6 - Remove hb_ot_shape_glyphs_closure()?
12 - Language to/from script.
18 - Add query / enumeration API for aalt-like features?
20 - Add segmentation API
22 - Add hb-fribidi glue?
25 hb-view / hb-shape enhancements:
26 ===============================
28 - Add --width, --height, --auto-size, --ink-box, --align, etc?