value is unsigned int

src/urldecode.cpp

@@ -22,7 +22,7 @@ CharacterVector url_decode(CharacterVector url) {
         output += input[i];
         i++;
       } else {
-        int value;
+        unsigned int value;
         sscanf(input.substr(i + 1, 2).c_str(), "%x", &value);
         output += static_cast<char>(value);
         i += 3;