linuxmaniac left a comment (kamailio/kamailio#4563)
I looked at https://en.cppreference.com/w/cpp/string/byte/isalnum.html
> Notes
> Like all other functions from
> [<cctype>](https://en.cppreference.com/w/cpp/header/cctype.html), the
> behavior of std::isalnum is
> undefined if the argument's value is neither representable as unsigned char
> nor equal to [EOF]
> (https://en.cppreference.com/w/cpp/io/c.html). To use these functions safely
> with plain chars (or signed chars), the argument
> should first be converted to unsigned char:
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