### Fixed

* Fix exception on Post after MailboxProcessor was disposed ([Issue #17849](https://github.com/dotnet/fsharp/issues/17849), [PR #17922](https://github.com/dotnet/fsharp/pull/17922))
* Fix missing null annotation in Async.SwitchToContext ([Issue #18055](https://github.com/dotnet/fsharp/issues/18055), [PR #18059](https://github.com/dotnet/fsharp/pull/18059))

### Added

### Changed

* String function changed to guarantee a non-null string return type ([PR #17809](https://github.com/dotnet/fsharp/pull/17809))
* Add Parameters as valid target for the Struct attribute ([Language suggestion #1136](https://github.com/fsharp/fslang-suggestions/issues/1136), [PR #18098](https://github.com/dotnet/fsharp/pull/18098))


### Breaking Changes
