code: @Override
      public Stream<Class> scan(String annotation, String pkg) {
          if (pkg == null) {
              return Stream.empty();
          }
          List<Class> classes = doScan(annotation, pkg);
          return classes.stream();
      }
docs: Scan the given packages.
  
  @param annotation The annotation to scan for
  @param pkg        The package to scan
  @return A stream of classes