fix: accuracy loss when convert float to string

src/utils.cpp

@@ -55,7 +55,7 @@ std::string Any2String(const std::any &value) {
   std::stringstream buf;
   std::string res;
   if (auto ptr = std::any_cast<double>(&value)) {
-    buf << std::setiosflags(std::ios::fixed) << std::setprecision(15) << *ptr;
+    buf << std::fixed << std::setprecision(310) << *ptr;
   } else if (auto ptr = std::any_cast<bool>(&value)) {
     if (*ptr)
       buf << "True";