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std::string uppercase(const std::string &);
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std::string lowercase(const std::string &);
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std::string tostring(unsigned long long);
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31
std::string utf8(wchar_t);
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std::string utf8_sanitize(const std::string &);
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std::string utf8(uint16_t *s, size_t length = -1, bool forcelittleendian = false);