Fix 20599 overflow error  when int in json is too large
- [ ] closes #20599
- [ ] tests added / passed
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

Hello @ssikdar1! Thanks for updating the PR.





Cheers ! There are no PEP8 issues in this Pull Request. :beers: 

##### Comment last updated on June 10, 2018 at 15:21 Hours UTC see my comments in the issue

