- Fix exception on Post after MailboxProcessor was disposed (Issue #17849, PR #17922)
- Fix missing null annotation in Async.SwitchToContext (Issue #18055, PR #18059)
- Fix printf handling of -0.0 (negative zero) values for float, float32, and decimal values (Issue #15557 and Issue #15558, PR #18147)
- String function changed to guarantee a non-null string return type (PR #17809)