ObjC multiple return type warning

[liamappelbe]

There are some methods triggering the multiple return type warning from in the interface parser. Need to investigate to figure out what this means.

[WARNING]: Method "changeWithObject:type:index:" in instance "NSOrderedCollectionChange" has multiple return types.
[WARNING]: Method "changeWithObject:type:index:associatedIndex:" in instance "NSOrderedCollectionChange" has multiple return types.
[WARNING]: Method "differenceByTransformingChangesWithBlock:" in instance "NSOrderedCollectionDifference" has multiple return types.
[WARNING]: Method "registeredTypeIdentifiersWithFileOptions:" in instance "NSItemProvider" has multiple return types.