 * Fix serif length of Cyrillic Yeru under Iosevka Etoile (#922).
 * Add central serif for Cyrillic Zhe, Big Yus and Small Yus (#922).
 * Reduce serifs of italic Cyrillic Ka, El, Em, En, Che, Yer, and Yu (#922).
 * Add rounded and cursive shape for Yer, Yeri, Yery, Nje and Lje (#922).
 * Add a tri-serif variant to `A` (#925).
