Strip spaces.
Fix Issue 12184 - Implement advanced formatting support for std.uni.InversionList.
Strip spaces.
Add a disabled clear() method to Appender in the else branch to avoid UFCS hijacking.
Merge pull request #2141 from AndrejMitrovic/AppenderClear

Appender clear
Merge pull request #2126 from AndrejMitrovic/Fix12184

Issue 12184 - Implement advanced formatting support for std.uni.InversionList