elements of ordered_non_unique index with same key don't preserve insertion order when inserted as range

[SCFrench]

The program below as-is inserts a set of values into a multi_index_container with ordered_non_unique indices via a for loop, with each element being inserted individually. When the elements with the key "Bob" (as identified by equal_range) are iterated over, they appear in the same order as they were inserted (which can be seen by looking at the age of each "Bob"). However, if you change the #if 1 to #if 0 then the elements are inserted via a call to the iterator range-based overload of insert. In this case, the ages of the people named "Bob" are not displayed in the order of insertion (which I assume would be forward pass from the begin iterator to the end iterator).

The following demo program can also be found here: https://gcc.godbolt.org/z/EvG4rW1ba

#include <iostream>
#include <string>
#include <boost/multi_index_container.hpp>
#include <boost/multi_index/ordered_index.hpp>
#include <boost/multi_index/member.hpp>

using namespace boost::multi_index;

struct person {
   std::string name;
   int age;
};

typedef multi_index_container<
   person,
   indexed_by<
      ordered_non_unique<member<person, std::string, &person::name>>,
      ordered_non_unique<member<person, int, &person::age>>
   > 
> person_set;

int main()
{
  std::vector<person> people = {
      {"Bob", 32},
      {"Charlie", 32},
      {"Bob", 32},
      {"Emily", 32},
      {"Bob", 30},
      {"Alex", 32},
      {"Bob", 56},
      {"Bob", 32}
   };

   person_set persons;

#if 1
   for (auto const & p : people)
   {
    persons.insert(p);
   }
#else
  persons.insert(people.begin(), people.end());
#endif

   std::cout << "People named Bob: \n";
   auto &name_index = persons.get<0>();
   auto range2 = name_index.equal_range("Bob");
   for (auto it = range2.first; it != range2.second; ++it) {
      std::cout << it->name << ", " << it->age << "\n";
   }

   return 0;
}

[joaquintides]

Thanks for the report! Fixed in f8143b9 if you'd like to confirm locally.

[SCFrench]

Confirmed locally. Thanks for the fast response!