This package is meant to augment the Char one in elm/core, by offering Unicode-aware isLower/isUpper/isDigit/... functions.
The current version of the package is based on Unicode 13.0.0.
The package can be tested using elm-test. Warning: the test will take a long time and probably crash elm-test.
Just run make while inside the generator directory. It will download raw data from the Unicode website and build the .elm file