~jaro/balkon

ref: c4368fbcb56f06524d52fbdbbb984be772bb1f8c balkon/test/Data/Text/ParagraphLayout/RunSpec.hs -rw-r--r-- 1.6 KiB 
Minimise working with Data.Text.Internal.

Link to Span using a generic wrapper.

Implement "plain" interface.

Separate tests by module.