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What problem does this code solve?
This is not a bug fix, it is an enhancement to make JSONArray iterable.
See #130
Also see #77
Has functionality changed?
No change to existing functionality, but JSONArray now implements Iterable,
and a new API method was added.
Verified via unit test?
Yes. I added 1 test to JSONArrayTest. See stleary/JSON-Java-unit-test#14.
The new unit test will be merged after this pull request is merged.