With special thanks to @RedCMD for finding and reporting all of the following:
- Allow comment after top-level block scalar with explicit indent indicator (#547)
- Allow tab as indent for line comments before nodes (#548)
- Do not allow tab before block collection (#549)
- In flow collections, allow
[]{}immediately after:with plain key (#550) - Require indentation for
?explicit-key contents (#551) - Require indentation from block scalar header & flow collections in mapping values (#553)