[struct_pb] std::out_of_range: unknown key

[PikachuHyA]

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• I searched the issues and found no similar issues.

What happened + What you expected to happen

support unknown

Reproduction way

struct person : struct_pb::base_impl<person> {
  int age;
  std::string name;
};
struct person2 : struct_pb::base_impl<person2> {
  int age;
  std::string name;
  int salary;
};
REFLECTION(person, age, name);
REFLECTION(person2, age, name, salary);
int main() {
  person p1{};
  p1.age = 100;
  p1.name = "abc";
  std::string s;
  struct_pb::to_pb(p1, s);
  person2 p2{};
  struct_pb::from_pb(p2, s);
  std::cout << p2.age << std::endl;
  std::cout << p2.name << std::endl;
  std::cout << p2.salary << std::endl;
  p2.salary = 1000;
  struct_pb::to_pb(p2, s);
  person p3{};
  struct_pb::from_pb(p3, s);
  std::cout << p3.age << std::endl;
  std::cout << p3.name << std::endl;
  return 0;
}

got error

100
abc
0
libc++abi: terminating due to uncaught exception of type std::out_of_range: unknown key

Anything else

Are you willing to submit a PR?

• Yes I am willing to submit a PR!