assignsDefaultValueForMissingAttributes overwritten in inverse mappings

[pablobfs]

Hi there, I think I found an issue in latest release, 0.23.3.

I create an object mapping and set assignsDefaultValueForMissingAttributes to NO, then I create the inverse mapping and the assignsDefaultValueForMissingAttributes value is overwritten to YES.

RKEntityMapping *mapping = [RKEntityMapping mappingForEntityForName:[self entityName] inManagedObjectStore:[RKManagedObjectStore defaultStore]];
mapping.assignsDefaultValueForMissingAttributes = NO;
// map attributes and relationships...

RKObjectMapping *inverse = mapping inverseMapping];
// inverse.assignsDefaultValueForMissingAttributes == YES

I tracked the issue down to the - (RKObjectMapping *)invertMapping:(RKObjectMapping *)mapping withPredicate:(BOOL (^)(RKPropertyMapping *propertyMapping))predicatemethod in the RKObjectMapping class , it contains the following lines:

// We want to serialize `nil` values
inverseMapping.assignsDefaultValueForMissingAttributes = YES;