property_name : PropertyName
BidiClass
BidiClass :: # (opaque)
The Unicode Bidi_Class (bc) directional class from
DerivedBidiClass.txt. This is input to UAX #9; this module does not run
the bidirectional algorithm or reorder text.
of_scalar : Scalar -> Value
alias_count : Value -> U8
Value : Value
PropertyName : { short : Str, long : Str }
Run : { range : TextRange, value : Value }
AliasError : [UnknownAlias]