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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+# Unreleased
+
+### Added
+
+### Changed
+
+### Fixed
+
+# [0.9.8] - 2023-04-03
+
+### Fixed
+
+- Unsoundness in `Once::try_call_once` caused by an `Err(_)` result
+
+# [0.9.7] - 2023-03-27
+
+### Fixed
+
+- Relaxed accidentally restricted `Send`/`Sync` bounds for `Mutex` guards
+
+# [0.9.6] - 2023-03-13
+
+### Fixed
+
+- Relaxed accidentally restricted `Send`/`Sync` bounds for `RwLock` guards
+
+# [0.9.5] - 2023-02-07
+
+### Added
+
+- `FairMutex`, a new mutex implementation that reduces writer starvation.
+- A MSRV policy: Rust 1.38 is currently required
+
+### Changed
+
+- The crate's CI now has full MIRI integration, further improving the confidence you can have in the implementation.
+
+### Fixed
+
+- Ensured that the crate's abstractions comply with stacked borrows rules.
+- Unsoundness in the `RwLock` that could be triggered via a reader overflow
+- Relaxed various `Send`/`Sync` bound requirements to make the crate more flexible
+
+# [0.9.4] - 2022-07-14
+
+### Fixed
+
+- Fixed unsoundness in `RwLock` on reader overflow
+- Relaxed `Send`/`Sync` bounds for `SpinMutex` and `TicketMutex` (doesn't affect `Mutex` itself)
+
+# [0.9.3] - 2022-04-17
+
+### Added
+
+- Implemented `Default` for `Once`
+- `Once::try_call_once`
+
+### Fixed
+
+- Fixed bug that caused `Once::call_once` to incorrectly fail
+
+# [0.9.2] - 2021-07-09
+
+### Changed
+
+- Improved `Once` performance by reducing the memory footprint of internal state to one byte
+
+### Fixed
+
+- Improved performance of `Once` by relaxing ordering guarantees and removing redundant checks
+
+# [0.9.1] - 2021-06-21
+
+### Added
+
+- Default type parameter on `Once` for better ergonomics
+
+# [0.9.0] - 2021-03-18
+
+### Changed
+
+- Placed all major API features behind feature flags
+
+### Fixed
+
+- A compilation bug with the `lock_api` feature
+
+# [0.8.0] - 2021-03-15
+
+### Added
+
+- `Once::get_unchecked`
+- `RelaxStrategy` trait with type parameter on all locks to support switching between relax strategies
+
+### Changed
+
+- `lock_api1` feature is now named `lock_api`
+
+# [0.7.1] - 2021-01-12
+
+### Fixed
+
+- Prevented `Once` leaking the inner value upon drop
+
+# [0.7.0] - 2020-10-18
+
+### Added
+
+- `Once::initialized`
+- `Once::get_mut`
+- `Once::try_into_inner`
+- `Once::poll`
+- `RwLock`, `Mutex` and `Once` now implement `From<T>`
+- `Lazy` type for lazy initialization
+- `TicketMutex`, an alternative mutex implementation
+- `std` feature flag to enable thread yielding instead of spinning
+- `Mutex::is_locked`/`SpinMutex::is_locked`/`TicketMutex::is_locked`
+- `Barrier`
+
+### Changed
+
+- `Once::wait` now spins even if initialization has not yet started
+- `Guard::leak` is now an associated function instead of a method
+- Improved the performance of `SpinMutex` by relaxing unnecessarily conservative
+  ordering requirements
+
+# [0.6.0] - 2020-10-08
+
+### Added
+
+- More dynamic `Send`/`Sync` bounds for lock guards
+- `lock_api` compatibility
+- `Guard::leak` methods
+- `RwLock::reader_count` and `RwLock::writer_count`
+- `Display` implementation for guard types
+
+### Changed
+
+- Made `Debug` impls of lock guards just show the inner type like `std`