Open Radar

 
Sample project can be downloaded here:  http://cl.ly/1P2c0d1m3q15

Summary:

When a NSMutableOrderedSet object is encoded, and then decoded using NSCoder, it is decoded as the wrong object type.

Steps to Reproduce:

// need to define path and error

NSMutableOrderedSet *mutableSet = [[NSMutableOrderedSet alloc] init];
[mutableSet addObject:@"test"];

NSData *archiveData = [NSKeyedArchiver archivedDataWithRootObject:mutableSet];
[archiveData writeToFile:path options:NSDataWritingAtomic error:&error];

NSData *archiveData2 = [fileManager contentsAtPath:path];
NSMutableOrderedSet *mutableSet2 = [NSKeyedUnarchiver unarchiveObjectWithData:archiveData2];

[mutableSet2 addObject:@"test 2"];  //throws exception because mutableSet2 is immutable

Expected Results:

Either decode the object in the same type that was archived, or display a warning when assigning the results to a mutable object.

Actual Results:

No indication of failure

Exception thrown when attempting to mutate object

Regression:

Unknown