"strtod range over" for self generated json

[takei-yuya]

int main()
{
   std::ostringstream oss;
   double d = 6.92837873186e-310;
   
   // https://github.com/retrieva/pficommon/blob/master/src/text/json/base.h#L263
   oss << std::setprecision(12) << d;
   std::cout << oss.str() << std::endl;
   
   // https://github.com/retrieva/pficommon/blob/master/src/text/json/parser.cpp#L284
   std::string s = oss.str();
   char* endptr;
   double d2 = strtod(s.c_str(), &endptr);
   std::cout << "d2 = "  << d2 << ", errno = " << errno << "(" << std::strerror(errno) << ")" << std::endl;
}

6.92837873186e-310
d2 = 6.92838e-310, errno = 34(Numerical result out of range)