JSON formatting broken in locale with comma separator

Hello,
first off, thank you for this piece of software. It runs very well and is easy to use.
It seems though that I ran into a bug (sorry if I'm wrong).
My locale is fr_FR and therefore floating numbers are formatted with a comma (ie 1,3 and not 1.3 as in English).
Now when I set vosk_recognizer_set_max_alternatives to more than one, vosk_recognizer_result and vosk_recognizer_final_result return a json string containing several alternatives with a confidence level for each one expressed as a floating number. It turns out that this number is formatted according to the locale (with a comma) which makes the string unreadable by common json parsers since we get things like :
"alternatives" : [{
"confidence" : 361,788818,
"text" : ""
}]

and commas are used by json to separate values. If I save the locale, change it to us_US, execute one of the above functions and change it back to what it was, it works (floating numbers are formatted with a dot).
I suspect we should get the same problem with vosk_recognizer_set_words (I didn't try though).
Thank you.