Refer the root object by single dot #253
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This closes #234.
When I have a list of items (could be objects as well) in the json data file.
Now when trying to use them in a loop like
Consideration: Is "." appropriate to refer the root document? If not, I'll make another pull request.
Note: This is ad-hoc fix. "." cannot be set as the second or later argument. It may be fixed by #247 though I have not confirmed it.