[issue37070] Clean up f-string debug handling, including potential memory leaks

[Eric V. Smith]

Change by Eric V. Smith <eric at trueblade.com>:


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keywords: +patch
pull_requests: +13513
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/13607

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37070>
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