new float/double to string algorithm

[xjb714]

I share the floating-point number printing algorithm I have completed, which has an advantage in performance compared to other algorithms. Source: https://github.com/xjb714/xjb. The principle of the algorithm is rather complex, so understanding it may take a lot of time. All developers are welcome to understand and use it. All the code is free to use.

[nlohmann]

This looks interesting! Once I have some time, I will check how much effort it is to integrate this for a benchmark. If anyone else is curious - PRs welcome!