Unicode GeneralCategory look-up from prepared CharCats.dat binary file

Char.x

/**
 * The Unicode General Category of the character.
 *
 * This information is field 2 in the `UnicodeData.txt` data file from the Unicode Consortium.
 * From [https://www.unicode.org/reports/tr44/#General_Category_Values]:
 *
 * > This is a useful breakdown into various character types which can be used as a default
 * > categorization in implementations. For the property values, see
 * > [General Category Values](https://www.unicode.org/reports/tr44/#General_Category_Values).
 *
 * This information is stored in the binary file "CharCats.dat" in this package. For a codepoint
 * `n`, the n-th byte of the file is the ordinal of the `GeneralCategory` enum value for the
 * character.
 */
GeneralCategory unicodeCategory.get()
    {
    Byte[] categoriesByCodepoint = #./CharCats.dat;
    return codepoint < categoriesByCodepoint.size
            ? GeneralCategory.values[categoriesByCodepoint[codepoint].toInt()]
            : Unassigned;
    }