v2.3.0

Enhancements:

• Added Promise.Wait() and Promise<T>.WaitForResult() synchronous APIs.
• CancelationRegistration now implements IDisposable and IAsyncDisposable interfaces. Disposing the registration will unregister the callback, or wait for the callback to complete if it was already invoked.
• Added CancelationToken.GetRetainer() API to reduce TryRetain / Release boilerplate code.
• Un-deprecated Deferred.IsValid, and changed it to return whether the Deferred.Promise is valid, instead of returning Deferred.IsValidAndPending.

Fixes:

• Fixed PromiseYielder when different runners are used on a re-used routine.
• Fixed NullReferenceException when the AppDomain is unloaded.

Deprecated:

• deprecated Promise.ResultContainer.RejectContainer, replaced with Promise.ResultContainer.RejectReason.
• deprecated CancelationToken.Retain() (prefer TryRetain()).
• deprecated CancelationRegistration.Unregister() (prefer TryUnregister() or Dispose()).

Misc:

• CancelationToken.Register(callback) now returns a default registration if it failed to register instead of throwing.

Breaking Changes:

• Removed Promise<T>.RaceWithIndex and Promise<T>.FirstWithIndex APIs in build targets older than .Net Standard 2.1. Promise.RaceWithIndex<T> and Promise.FirstWithIndex<T> APIs can be used instead.