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Docs for chrono type S decimal point locale does not match code #4117

Description

@tearfur

The decimal point character for the chrono type 'S' seems to be locale-independent, contrary to what the docs says. Reproduced at https://godbolt.org/z/TKxcq5hf6.

From the docs:

The character for the decimal point is localized according to the locale. The modified command %OS produces the locale's alternative representation.

Relevant code (I think):

*out++ = '.';

*out++ = '.';

fmt::format_to(std::back_inserter(buf), FMT_STRING("{:.{}f}"),

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