Mostly, we filled in a bunch of small gaps that were found in pgrx's type implementations because we lacked adequate testing.
Otherwise, see the release notes for 0.12.0-beta.0!
What's Changed
- Missing ArgAbi and BoxRet trait implementations for datums by @danbluhmhansen in #1757
- don't swallow panics from spawned threads by @jyn514 in #1763
- Avoid exceeding sun_path by @workingjubilee in #1766
- Add UnboxDatum impls for Json and JsonB by @workingjubilee in #1770
Full Changelog: v0.12.0-beta.1...v0.12.0-beta.2