@Override
      public Builder mergeFrom(com.google.protobuf.Message other) {
        if (other instanceof Person) {
          return mergeFrom((Person)other);
        } else {
          super.mergeFrom(other);
          return this;
        }
      }
Protobuf type {@code com.alibaba.fastjson2.protobuf.Person}
core/src/test/java/com/alibaba/fastjson2/protobuf/PersonOuterClass.java