Archiving Notes

There is a preliminary implementation of NSKeyedArchiver and NSKeyedUnarchiver which should be compatible with the macOS version.

NSKeyedUnarchiver reads the entire plist into memory before constructing the object graph, it should construct it incrementally as does Foundation on macOS
Paths that raise errors vs. calling _fatalError() need to be reviewed carefully
The signature of the decoding APIs that take a class whitelist has changed from NSSet to [AnyClass] as AnyClass does not support Hashable. The API change has been marked Experimental.
classForKeyed[Un]Archiver has moved into NSObject so it can be overridden, move this back into an extension eventually

Classes

Implemented

NSArray
NSCalendar
NSCFArray (encodes as NSArray)
NSCFDictionary (encodes as NSDictionary)
NSCFSet (encodes as NSSet)
NSCFString (encodes as NSString)
NSConcreteValue
NSData
NSDate
NSDictionary
NSError
NSLocale
NSNotification
NSNull (no-op)
NSOrderedSet
NSPersonNameComponents
NSPort (not supported for keyed archiving)
NSSet
NSSpecialValue (for limited number of types)
NSString
NSTimeZone
NSURL
NSUUID
NSValue (via class cluster hack)

TODO

Pending actual class implementation

NSAttributedString

Pending coder implementation

NSAffineTransform
NSCharacterSet
NSDecimalNumber
NSDecimalNumberHandler
NSExpression
NSIndexPath
NSIndexSet
NSPredicate
NSSortDescriptor
NSTextCheckingResult
NSURLAuthenticationChallenge
NSURLCache
NSURLCredential
NSURLProtectionSpace
NSURLRequest