We do indeed do setlocale(LC_ALL, "");

Asked some questions about locale settings and what exactly triggered this; can't reproduce yet.

Sent 257a172 to reporter.

int main()
{
    setlocale(LC_ALL, "");
    struct lconv* lc = localeconv();
    printf("thousands %s decimal %s\n", lc->thousands_sep, lc->decimal_point);
    return 0;
}

This gives the values from the custom settings fine. But - if you change the decimal separator to a "." in the spanish locale you then have the thousands separator also being a .

Thenmake_raw in src/raw_convert.cc is totally broken. We could implement it ourselves, but it is very complicated to get it just right.

...or find some equivalent to std::to_chars from C++17

https://github.com/fmtlib/fmt isn't quite it, but maybe as close as we'll get.

... and fmt only goes from number to string, not back (though that is easier)