Swift Unwrapped

What should you expect with Swift 4? Some great new features and improvements. Ole's Swift 4 playground: https://oleb.net/blog/2017/05/whats-new-in-swift-4-playground/ Swift Evolution Proposal SE-0165: Dictionary and Set Enhancements Swift Evolution Proposal SE-0173: Add MutableCollection.swapAt(_:_:) Swift Evolution Proposal SE-0176: Enforce Exclusive Access to Memory Swift Evolution Proposal SE-0171: Reduce with inout Swift Evolution Proposal SE-0148: Generic Subscripts Swift Evolution Proposal SE-0170: NSNumber bridging and Numeric types Swift Evolution Proposal SE-0156: Class and Subtype existentials