Hi Riccardo, Am 11.07.2025, 15:17:25 schrieb Riccardo Mottola <riccardo.mott...@libero.it >:
> > Shouldn't thus the method called on the subclass still return a valid > subclass and not the superclass? > > Could it be a header issue? we define it as: > + (NSCharacterSet*) characterSetWithCharactersInString: (NSString*)aString; > > maybe it should return instancetype? > I had changed these return types from id to NSCharacterSet in https://github.com/gnustep/libs-base/pull/501, because that is what the implementation returns by calling „copy“ on the created set before returning. This matches Apple platforms both in the implementation and header declaration. Frederik
