v1.9.0

What's Changed

• ✨ feat(clean): transform trees before serialization by @gaborbernat in #797
• perf(core): reduce repeated tree and text work by @gaborbernat in #795
• fix(types): preserve node types across cleaning and DOM APIs by @gaborbernat in #798
• perf: improve HTML processing and extend benchmarks by @gaborbernat in #799

Full Changelog: 1.8.0...1.9.0