* Fix island deduplication ignoring props.
Re-resolves an issue initially patched in https://github.com/withastro/astro/pull/846 but seemingly lost in the 0.21.0 mega-merge (d84bfe719a).
This change makes the component render step account for all props, even if they don't affect the generated HTML, when deduplicating island mount.
* Fix React component test using different rendered props to test deduplication.
* fix: improve serialization support for non-JSON objects
Co-authored-by: Nate Moore <nate@skypack.dev>
