Fix override str util function to handle new lines and quotes correctly #2974
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Motivation
There were some bugs in the original implementation of this function when it came to quotes and backslashes in strings. I've fixed them and added better round-trip tests.
Have you read the Contributing Guidelines on pull requests?
Yes
Test Plan
Tests pass (the one failure is also happening on master and seems circle ci related and we're moving off of circle ci anyway in #2974
Related Issues and PRs
(Is this PR part of a group of changes? Link the other relevant PRs and Issues here. Use https://help.github.com/en/articles/closing-issues-using-keywords for help on GitHub syntax)
#2934