• [instancer] Recalc OS/2 AvgCharWidth after instancing if default changes (#3317).
• [otlLib] Make ClassDefBuilder class order match varLib.merger's, i.e. large classes first, then glyph lexicographic order (#3321, #3324).
• [instancer] Allow not specifying any of min:default:max values and let be filled up with fvar's values (#3322, #3323).
• [instancer] When running --update-name-table ignore axes that have no STAT axis values (#3318, #3319).
• [Debg] When dumping to ttx, write the embedded JSON as multi-line string with indentation (92cbfee).
• [varStore] Handle > 65535 items per encoding by splitting VarData subtable (#3310).
• [subset] Handle null-offsets in MarkLigPos subtables.
• [subset] Keep East Asian spacing fatures vhal, halt, chws, vchw by default (#3305).
• [instancer.solver] Fixed case where axisDef < lower and upper < axisMax (#3304).
• [glyf] Speed up compilation, mostly around recalcBounds (#3301).
• [varLib.interpolatable] Speed it up when working on variable fonts, plus various micro-optimizations (#3300).
• Require unicodedata2 >= 15.1.0 when installed with 'unicode' extra, contains UCD 15.1.