Continue work on making fuzzer fixes precise, tested, and documented

[juntyr]

Follow-up to #523

• [ ] I've included my change in CHANGELOG.md

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

:exclamation: No coverage uploaded for pull request base (master@d3e9ebe). Click here to learn what that means.

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Additional details and impacted files

@@            Coverage Diff             @@
##             master      #524   +/-   ##
==========================================
  Coverage          ?   100.00%           
==========================================
  Files             ?        83           
  Lines             ?     14649           
  Branches          ?         0           
==========================================
  Hits              ?     14649           
  Misses            ?         0           
  Partials          ?         0           

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