anchor.diff:    final result = [];
     for (var i in items) {
       if (i is List) {
  -      result.add(keys ? ee(i[0], gen(i[1])) : ei(gen(i[1])));
  +      result.add(keys ? ee(i[0], gen(i[1], keys)) : ei(gen(i[1], keys)));
       } else {
         result.add(keys ? ee('text_$i', i.toString()) : ei(i.toString()));
       }
  
positive.code:       });
  
        group('Into two elements list', () {
          final a = ee(0, gen([998, 999]));
  
          final tests = [
            {'b': [1, 998, 999]},
  
negative.code:       });
  
        group('Into one element list', () {
          final a = ee(0, gen([999], false));
  
          final tests = [
            {'b': [1]},
  