private com.google.protobuf.MapField<String, DriverCard>
      internalGetMutableCardsmap() {
        onChanged();;
        if (cardsmap_ == null) {
          cardsmap_ = com.google.protobuf.MapField.newMapField(
              CardsmapDefaultEntryHolder.defaultEntry);
        }
        if (!cardsmap_.isMutable()) {
          cardsmap_ = cardsmap_.copy();
        }
        return cardsmap_;
      }
<code>repeated .com.alibaba.fastjson2.dubbo.DriverCard cards = 17;</code>
core/src/test/java/com/alibaba/fastjson2/dubbo/GoogleProtobufBasic.java