* [**Breaking**] Add shorter-serif variant for capital I (OpenType tags reordered compared to alpha.1; #709).
 * Fix broken Bulgarian localized of Cyrillic Small Sha and Cyrillic Capital El (#716).
 * Fix broken serif shapes in Italic Cyrillic Small I (#717).
 * Make variant selectors for `m` and `u` have more effect on Cyrillic letters.
 * Fix incorrect serifs of Greek Small Rho (#718).
 * Add derived bold / italic / sans-serif / typewriter letters in Mathematical Alphanumeric Symbols block.
 * Support slope-dependent digit form control (#724).
 * Update `ss09` style for capital G to Toothless (#726).
 * Character Addition:
   - U+0462 CYRILLIC CAPITAL LETTER YAT and U+0463 CYRILLIC SMALL LETTER YAT (#727).