3.0.0 alpha 1

This is the first alpha release of ReactiveSwift 3.0. It supports Swift 3.2 and Swift 4.0, and requires either Xcode 9 or the Swift 4.0 OSS compiler toolchain.

Breaking Change

1. Signal now uses Lifetime for resource management. (#404, kudos to @andersio)

   The Signal initialzer now accepts a generator closure that is passed with the input Observer and the Lifetime as its arguments. The original variant accepting a single-argument generator closure is now obselete. This is a source breaking change.

   // New: Add `Disposable`s to the `Lifetime`.
   let candies = Signal<U, E> { (observer: Signal<U, E>.Observer, lifetime: Lifetime) in
      lifetime += trickOrTreat.observe(observer)
   }
   
   // Obsolete: Returning a `Disposable`.
   let candies = Signal { (observer: Signal<U, E>.Observer) -> Disposable? in
      return trickOrTreat.observe(observer)
   }

Bugfix

1. Workaround an unexpected EGAGIN error being returned by pthread in 32-bit ARM debug builds. (#508)

Changes

1. ReactiveSwift has been migrated to Swift 4.0. (#422, kudos to @andersio)

2. SignalProducer.startWithSignal now returns the value of the setup closure. (#533, kudos to @Burgestrand)

3. Disabled code coverage data to allow app submissions with Xcode 9.0 (see Carthage/Carthage#2056, kudos to @NachoSoto)

4. The SignalProducer internals have undergone a significant refactoring, which bootstraps the effort to reduce the overhead of constant producers and producer compositions. (#487, kudos to @andersio)

Deprecation

1. Signal.Observer.action has been deprecated. Use Signal.Observer.send instead. (#515)