Would it be possible to separate the change to NSKeyedUnarchiver in 1d1ddba9 
into a separate commit?

> On 5 Aug 2016, at 6:21 AM, Philippe Hausler via swift-dev 
> <swift-dev@swift.org> wrote:
> 
> With a freshly built toolchain from ToT swift, building ToT 
> swift-corelibs-foundation I am getting some very strange failures in the unit 
> tests:
> 
> Test Suite 'TestNSKeyedArchiver' started at 13:15:01.843
> Test Case 'TestNSKeyedArchiver.test_archive_array' started at 13:15:01.843
> assertion failed: file 
> /Volumes/Users/phausler/Documents/Public/swift/swift-corelibs-foundation/Foundation/NSKeyedArchiver.swift,
>  line 23
> 2016-08-04 13:15:07.650689 TestFoundation[47395:4939580] assertion failed: 
> file 
> /Volumes/Users/phausler/Documents/Public/swift/swift-corelibs-foundation/Foundation/NSKeyedArchiver.swift,
>  line 23
> Current stack trace:
> 
> this is being caused by the line:
> 
> let classReference = innerDecodingContext.dict["$class"] as? 
> CFKeyedArchiverUID
> 
> CFKeyedArchiverUID being AnyObject
> 
> and 
> 
> class DecodingContext {
>        fileprivate var dict : Dictionary<String, Any>
>       …
> }
> 
> It claims a conditional cast from Any? to AnyObject always succeeds but it is 
> giving me an unexpected type later on
> 
> Changing to:
> 
> let classReference = innerDecodingContext.dict["$class"] as 
> CFKeyedArchiverUID?
> 
> Then makes the process no longer crash, however it then fails in an even more 
> strange way:
> 
> 
> guard let root = try unarchiver.decodeTopLevelObjectOfClasses(classes,
>                        forKey: NSKeyedArchiveRootObjectKey) as? NSObject else 
> {
> 
> by expanding that out the decoded object is a NSArray (expected), but that 
> cannot be represented as an NSObject?! This isn’t Swift, this is madness!
> 
> Perhaps there is some other failure that I am not seeing underpinning this?
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