message: compile fix found via latest GCC 10
diff: @@ -397,7 +397,7 @@ optional<variant<terminal::Key, char32_t>> parseKeyOrChar(string const& _name)
  auto const name = toUpper(_name);
  for (auto const& mapping: namedChars)
  if (name == mapping.first)
  - return mapping.second;
  + return static_cast<char32_t>(mapping.second);
  return nullopt;
  }
  