Loss of type information for covered queries in WiredTiger

#include <iostream> #include <vector> #include "mongo/client/dbclient.h"   using namespace std; using namespace mongo;   int main() { client::initialize(); DBClientConnection c; c.connect( "localhost" );   c.dropDatabase( "test" ); c.createIndex( "test.wow" , IndexSpec().addKeys(BSON( "a" << 1)));   BSONObj toInsert = BSON( "a" << 1); cout << "type in: " << toInsert.getField( "a" ).type() << endl; c.insert( "test.wow" , toInsert);   BSONObj distinct; c.runCommand( "test" , BSON( "distinct" << "wow" << "key" << "a" ), distinct);   vector<BSONElement> result = distinct.getField( "values" ).Array(); cout << "type out: " << result[0].type() << endl; } $ g++ test.cpp -I ./include -L ./lib -lmongoclient -lboost_system -lboost_regex -lboost_thread $ ./a.out type in: 16 type out: 1