A bug of number parse and stringify when locale settings is special

[twinstar6980]

VERSION: quickjs 2021-03-27
OS: Win11-21H2-ZHCN and Win10-21H2-RUSSIAN

I use quickjs to run javascript in my program, but my user report a problem.
When I change the number point as comma, quickjs can't parse and stringify float correctly, but in some countries（like russia），the default number point of windows PC is comma.
for example:

I found the reason on "quickjs.c"
"strtod" will called on "js_strtod", "snprintf" will called on "js_fcvt1", when parse or stringify a Number object, js_strtod and js_fcvt1 will be called. , strtod and snprintf will use comma be a number point when system number point is comma

I hope this bug can be fixed

[bellard]

locale settings are not supported by QuickJS so it behaves as expected.

[fstirlitz]

This is not mentioned in the documentation, and even if it were, this is a very silly design decision to make. Locales are a perfectly legitimate feature of the C standard, relied on by many desktop applications, some of which may even not be directly written in C. This issue would be very easy to trigger when QuickJS is embedded as a scripting engine in another program.