🐛 8-bit integers show as characters instead of integers when passed through a stringstream

Found as part of work for #1298 (closed) in option_definition.cc, but can be found in other files as well. Can't detect all instances of it easily, but we can detect places where numeric_limits<T> is used. It's max() and min() calls result in T type. If T is an 8-bit integer, usually int8_t or uint8_t, it is interpreted in it's ASCII-coded format.