Unicode 12.0.0 was released on the 5th of march.
Accordingly the libraries mentioned at the end of this message had to be updated, consult the individual release notes for details. Both Uucd and Uucp are incompatible releases sinces new script and block enumerants had to be added.
As always if Unicode still puzzles you, have a look at Uucp’s absolute minimal Unicode introduction.
Best and happy fractioning,
Uucd 12.0.0 Unicode character database decoder for OCaml.
Uucp 12.0.0 Unicode character properties for OCaml.
Uunf 12.0.0 Unicode text normalization for OCaml.
Uuseg 12.0.0 Unicode text segmentation for OCaml.