I have encountered some problems with floating point conversion

I have encountered some problems with floating point conversion

Json::Value ReadFromString(std::string& strJson)
{
	try {
		const auto rawJsonLength = static_cast<int>(strJson.length());

		JSONCPP_STRING err;
		Json::Value root;

		Json::CharReaderBuilder builder;
		const std::unique_ptr<Json::CharReader> reader(builder.newCharReader());
		if (!reader->parse(strJson.c_str(), strJson.c_str() + rawJsonLength, &root, &err))
		{
			std::cout << "error" << std::endl;
			return false;
		}

		return root;
	}
	catch (std::exception& ec)
	{
		return false;
	}
}

std::string WriteToString(Json::Value jsRoot)
{
	std::string ret;
	try {
		Json::StreamWriterBuilder builder;
		builder["indentation"] = "";
		ret = Json::writeString(builder, jsRoot);
		return ret;
	}
	catch (std::exception& ec)
	{
		return ret;
	}
}
int main()
{
	try {
		std::string str = R"({"snr":9.2})";
		Json::Value jsSrc= ReadFromString(str);

		Json::Value jsDes;
		jsDes["snr"] = jsSrc["snr"];
		std::cout << WriteToString(jsDes) << std::endl;		
	}
	catch (std::exception& ec)
	{
		std::cout << ec.what() << std::endl;
	}
}

the output is {"snr":9.1999999999999993}
How to solve this problem

Start with the supplied C++ reproduction, focusing on Json::CharReaderBuilder, Json::StreamWriterBuilder, and Json::writeString. Check the existing floating-point parsing and serialization behavior and project guidance. Done is unclear because the issue asks how to solve the output but names no expected formatting, file, or test.