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# Changelog
Entries are listed in reverse chronological order.
## 2.5.0
* Add constant-timedness note to the documentation for `CtOption::unwrap_or_else`.
* Add `CtOption::expect`.
* Add `ConstantTimeEq::ct_ne` with default implementation.
* Add new `core_hint_black_box` feature from Diane Hosfelt and Amber
Sprenkels which utilises the original `black_box` functionality from
when subtle was first written, which has now found it's way into the
Rust standard library.
* Add new `const-generics` feature from @survived which adds support
for subtle traits for generic arrays `[T; N]`.
* Add new feature for supporting `core::cmp::Ordering` for types which
implement subtle traits, patch from @tarcieri.
* Update `rand` dependency to 0.8.
## 2.4.1
* Fix a bug in how the README was included in the documentation builds
which caused nightly builds to break.
## 2.4.0
* Add new `ConstantTimeGreater` and `ConstantTimeLess` traits, as well
as implementations for unsigned integers, by @isislovecruft.
## 2.3.0
* Add `impl ConstantTimeEq for Choice` by @tarcieri.
* Add `impl From<CtOption<T>> for Option<T>` by @CPerezz. This is useful for
handling library code that produces `CtOption`s in contexts where timing
doesn't matter.
* Introduce an MSRV policy.
## 2.2.3
* Remove the `nightly`-only asm-based `black_box` barrier in favor of the
volatile-based one, fixing compilation on current nightlies.
## 2.2.2
* Update README.md to clarify that 2.2 and above do not require the `nightly`
feature.
## 2.2.1
* Adds an `or_else` combinator for `CtOption`, by @ebfull.
* Optimized `black_box` for `nightly`, by @jethrogb.
* Optimized `black_box` for `stable`, by @dsprenkels.
* Fixed CI for `no_std`, by @dsprenkels.
* Fixed fuzz target compilation, by @3for.
## 2.2.0
* Error during `cargo publish`, yanked.
## 2.1.1
* Adds the "crypto" tag to crate metadata.
* New shorter, more efficient ct_eq() for integers, contributed by Thomas Pornin.
## 2.1.0
* Adds a new `CtOption<T>` which acts as a constant-time `Option<T>`
(thanks to @ebfull for the implementation).
* `Choice` now itself implements `ConditionallySelectable`.
## 2.0.0
* Stable version with traits reworked from 1.0.0 to interact better
with the orphan rules.