v13.6.3

• Merge pull request #540 from yjs/ytext-cleanup-538-refactor 9563612
• refactor #538 (formatting attrs) a bit ce098d0
• scan the document once for all ytexts when cleaning up 08801dd
• group cleanups for YText changes into a single transaction 3741f43

v13.6.2...v13.6.3