[openstreetmap/openstreetmap-website] The specific limits on keys and values are unclear. (Issue #3706)

[Aaron Muir Hamilton]

@tomhughes [said:](https://github.com/openstreetmap/openstreetmap-website/issues/2025#issuecomment-1252881853)
> I mean probably it works fine given the setlocale I've just always steered clear of them myself.
> 
> If it works as intended then it's counting codepoints though (which is good) not UTF16 values.

`setlocale` doesn't save you in this case, because `std:mbsrtowcs` behaviour depends on both the locale and the size of `wchar_t`. I think it is standardized in C++11 but implementation-defined before then. Outside C++11, `wchar_t` may be a UTF-16 code unit, whereas in C++11 I believe it will be a Unicode Scalar Value in a 4-byte native endian integer.

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