docs: protected <T> WorksheetSpec.RowFactory<T> rowFactoryFor(
              final Class<T> rowClass,
              final ExecutionContext ec) {
  
          return new WorksheetSpec.RowFactory<T>() {
              @Override
              public T create() {
                  final T importLine =
                          factoryService.instantiate(rowClass);
                  // allow the line to interact with the calling fixture
                  if(importLine instanceof FixtureAwareRowHandler<?>) {
                      final FixtureAwareRowHandler<?> farh = (FixtureAwareRowHandler<?>) importLine;
                      farh.setExecutionContext(ec);
                      farh.setExcelFixture2(ExcelFixture2.this);
                  }
                  return importLine;
              }
  
              @Override
              public Class<?> getCls() {
                  return rowClass;
              }
          };
      }