ObjFW  Diff

}
@end

@implementation OFMutableData
+ (void)initialize
{
	if (self == [OFMutableData class])
		object_setClass((id)&placeholder,
		placeholder.isa = [OFMutableDataPlaceholder class];
		    [OFMutableDataPlaceholder class]);
}

+ (instancetype)alloc
{
	if (self == [OFMutableData class])
		return (id)&placeholder;