Merge pull request #2054 from nlohmann/feature/issue1983

Fix bug in diff function

include/nlohmann/json.hpp

@@ -8347,7 +8347,7 @@ class basic_json
                     result.push_back(
                     {
                         {"op", "add"},
-                        {"path", path + "/" + std::to_string(i)},
+                        {"path", path + "/-"},
                         {"value", target[i]}
                     });
                     ++i;