More specifically, I didn't see any commits about multiple simultaneous writers having landed in main and it's not document as a feature in the release notes https://github.com/tursodatabase/turso/commits
neither the prerelease
https://github.com/tursodatabase/turso/releases/tag/v0.3.0-p...
nor their latest release.
https://github.com/tursodatabase/turso/releases/tag/v0.2.2
The core/mvcc directory does have commits though, so maybe you can.
https://github.com/tursodatabase/turso/commits/main/core/mvc...