~jaro/balkon

ref: f72b5805e6f857d963bf025d464a86a80b9374b1 balkon/test/Data/Text/ParagraphLayout/Internal/BiDiLevelsSpec.hs -rw-r--r-- 3.0 KiB 
Improve BiDi handling of numbers and neutrals.

Add tests for mixed text direction.

Convert legacy span directions into levels.