A file added in PR #558 is causing the `check-json` hook to fail [on the latest run](https://results.pre-commit.ci/run/github/17714713/1621048733.9K2Z1f7uRlu833UE4KHNJA). ```console Check JSON...............................................................Failed - hook id: check-json - exit code: 1 testing/resources/duplicate_key_json.json: Failed to json decode (Duplicate key: hello) ```