Test ultra narrow Arabic text.

Deprecate the Plain interface.

Add user data to spans.

Qualify Plain interface.

Future-proof records with options.

Qualify Plain ParagraphData.

Fix style: white space in exports and imports.

Fix style: bullet points in comments.

Fix typos in comments.

Test removing spaces around lines.

Support hard line breaks.

Test effect of paragraph prefix.

Add test for Devanagari.

Remove (~) operator from ParagraphConstruction.

The tilde operator was causing compilation errors with older versions
of GHC, possibly due to a conflict with the lazy pattern match syntax.

It has been replaced by a pure Haskell alternative that uses function
application.

Test forming and breaking ligatures.

Fix comment syntax.

Add line wrapping tests with spans.

Make SpanOptions a separate type.

Move non-public modules into Internal namespace.

Add test for RTL text.