UCA1400 collations (added by
MDEV-27009) currently use Unicode-5.2.0 case folding tables.
They should use Unicode-14.0.0 tables instead.
The difference (see attached diff-520-1400.diff) between these two files:
shows that a few hundred new case folding mapping pairs where added in these letter scripts:
Cyrillic, Gergian, Cherokee, Glagolitic, Coptic, Latin, Osage, Vithkuqi, Old Hungarian, Warang Citi, Medefaidrin, Adlam.
This SQL script demonstrates the out-dated case folding:
The above two characters (first appeared in Unicode-6.1) are expected to map to each other by functions UPPER and LOWER.