Ian Hattendorf 88a6ff0b65 Cast to unsigned char when using std::isalnum
std::isalnum expects an int in the range of unsigned char or -1 (EOF),
otherwise it exhibits undefined behavior. Casting from char to unsigned
char avoids this.

MSVC warns about this when compiling with /analyze.
2018-04-29 20:28:35 +02:00
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