The files were taken from http://www.json.org/JSON_checker/
> If the JSON_checker is working correctly, it must accept all of the pass*.json files and reject all of the fail*.json files.
Difference with JSON_checker dataset:
- *${n}.json renamed to *${n-1}.json to be 0-based
- fail0.json renamed to pass3.json as python json module allows JSON payload to be string
- fail17.json renamed to pass4.json as python json module has no problems with deep structures
- fail32.json renamed to fail0.json to fill gap
- fail31.json renamed to fail17.json to fill gap
