Open Radar

 
Summary:
While debugging my iMessage Extension in LLDB, printing an object from -[NSUserDefaults objectForKey:] emits `<extracting data from value failed>`.

Steps to Reproduce:
Debug an iMessage Extension in LLDB, which uses a app group named "group.com.example", which it shares with its host app. Ensure the iMessage Extension has the following code:

NSUserDefaults * _Nullable sharedDefaults = [[NSUserDefaults alloc] initWithSuiteName:@"group.com.example"];
[sharedDefaults setObject:@{ @"foo" : @[ @{ @"bar" : @"baz", }, ], }];
NSLog(@"sharedDefaults foo: %@", [sharedDefaults objectForKey:@"foo"]); // set a breakpoint here

At the breakpoint, run `po [sharedDefaults objectForKey:@"foo"]`

Expected Results:
LLDB prints:
(
    {
        "bar" = @"baz";
  },
)     

Actual Results:
LLDB prints:
<extracting data from value failed>

Regression:


Notes:
If I instead run the following in LLDB, I get the expected result:
po [NSArray arrayWithArray:[sharedDefaults objectForKey:@"foo"]]