std::string SettingRegistry::toString(const rapidjson::Value& dflt, std::string setting_name)
{
    if (dflt.IsString())
    {
        return dflt.GetString();
    }
    else if (dflt.IsTrue())
    {
        return "true";
    }
    else if (dflt.IsFalse())
    {
        return "false";
    }
    else if (dflt.IsNumber())
    {
        std::ostringstream ss;
        ss << dflt.GetDouble();
        return ss.str();
    } 
    else if (dflt.IsArray())
    {
        std::stringstream ss;
        ss << "[";
        bool first = true;
        for (auto it = dflt.Begin(); it != dflt.End(); ++it)
        {
            if (!first)
            {
                ss << ",";
            }
            ss << toString(*it);
            first = false;
        }
        ss << "]";
        return ss.str();
    }
    else 
    {
        logError("Unrecognized data type in JSON: %s has type %s\n", setting_name.c_str(), toString(dflt.GetType()).c_str());
        return "";
    }
}